diff --git a/src/Orchard.Tests.Modules/CodeGeneration/Commands/CodeGenerationCommandsTests.cs b/src/Orchard.Tests.Modules/CodeGeneration/Commands/CodeGenerationCommandsTests.cs
index 8f32a906a..c9c4959e7 100644
--- a/src/Orchard.Tests.Modules/CodeGeneration/Commands/CodeGenerationCommandsTests.cs
+++ b/src/Orchard.Tests.Modules/CodeGeneration/Commands/CodeGenerationCommandsTests.cs
@@ -58,16 +58,14 @@ namespace Orchard.Tests.Modules.CodeGeneration.Commands {
         }
 
         [Test]
+        [ExpectedException(typeof(OrchardException))]
         public void CreateDataMigrationTestNonExistentFeature() {
             CodeGenerationCommands codeGenerationCommands = new CodeGenerationCommands(_extensionManager,
                 _schemaCommandGenerator);
 
             TextWriter textWriterOutput = new StringWriter();
             codeGenerationCommands.Context = new CommandContext { Output = textWriterOutput };
-            bool result = codeGenerationCommands.CreateDataMigration("feature");
-
-            Assert.That(result, Is.False);
-            Assert.That(textWriterOutput.ToString(), Is.EqualTo("Creating Data Migration for feature\r\nCreating data migration failed: target Feature feature could not be found.\r\n"));
+            codeGenerationCommands.CreateDataMigration("feature");
         }
     }
 }
\ No newline at end of file
diff --git a/src/Orchard.Web/Core/Common/Scheduling/OwnedScheduledTaskHandler.cs b/src/Orchard.Web/Core/Common/Scheduling/OwnedScheduledTaskHandler.cs
new file mode 100644
index 000000000..5577ac963
--- /dev/null
+++ b/src/Orchard.Web/Core/Common/Scheduling/OwnedScheduledTaskHandler.cs
@@ -0,0 +1,30 @@
+using System;
+using Orchard.ContentManagement;
+using Orchard.Core.Common.Models;
+using Orchard.Security;
+using Orchard.Tasks.Scheduling;
+
+namespace Orchard.Core.Common.Scheduling {
+    public abstract class OwnedScheduledTaskHandler : IScheduledTaskHandler {
+        private readonly IOrchardServices _orchardServices;
+
+        protected OwnedScheduledTaskHandler(IOrchardServices orchardServices) {
+            _orchardServices = orchardServices;
+        }
+
+        protected void SetCurrentUser(ContentItem contentItem) {
+            IUser owner = null;
+            var commonPart = contentItem.As<CommonPart>();
+            if (commonPart != null) {
+                owner = commonPart.Owner;
+            }
+            if (owner == null) {
+                var superUser = _orchardServices.WorkContext.CurrentSite.SuperUser;
+                owner = _orchardServices.WorkContext.Resolve<IMembershipService>().GetUser(superUser);
+            }
+            _orchardServices.WorkContext.Resolve<IAuthenticationService>().SetAuthenticatedUserForRequest(owner);
+        }
+
+        public abstract void Process(ScheduledTaskContext context);
+    }
+}
\ No newline at end of file
diff --git a/src/Orchard.Web/Core/Orchard.Core.csproj b/src/Orchard.Web/Core/Orchard.Core.csproj
index e63beeb36..c06905952 100644
--- a/src/Orchard.Web/Core/Orchard.Core.csproj
+++ b/src/Orchard.Web/Core/Orchard.Core.csproj
@@ -227,6 +227,7 @@
   </ItemGroup>
   <ItemGroup>
     <Content Include="Common\Module.txt" />
+    <Compile Include="Common\Scheduling\OwnedScheduledTaskHandler.cs" />
     <Content Include="Common\Views\DefinitionTemplates\BodyTypePartSettings.cshtml" />
     <Content Include="Common\Views\DefinitionTemplates\BodyPartSettings.cshtml" />
     <Content Include="Common\Views\Fields.Common.Text.cshtml" />
diff --git a/src/Orchard.Web/Modules/Orchard.ArchiveLater/Handlers/UnpublishingTaskHandler.cs b/src/Orchard.Web/Modules/Orchard.ArchiveLater/Handlers/UnpublishingTaskHandler.cs
index 48c2dfd45..28e955f6d 100644
--- a/src/Orchard.Web/Modules/Orchard.ArchiveLater/Handlers/UnpublishingTaskHandler.cs
+++ b/src/Orchard.Web/Modules/Orchard.ArchiveLater/Handlers/UnpublishingTaskHandler.cs
@@ -1,27 +1,29 @@
 using JetBrains.Annotations;
 using Orchard.ContentManagement;
+using Orchard.Core.Common.Scheduling;
 using Orchard.Logging;
 using Orchard.Tasks.Scheduling;
 
 namespace Orchard.ArchiveLater.Handlers {
     [UsedImplicitly]
-    public class UnpublishingTaskHandler : IScheduledTaskHandler {
+    public class UnpublishingTaskHandler : OwnedScheduledTaskHandler {
         private readonly IContentManager _contentManager;
 
-        public UnpublishingTaskHandler(IContentManager contentManager) {
+        public UnpublishingTaskHandler(IContentManager contentManager, IOrchardServices orchardServices) : base(orchardServices) {
             _contentManager = contentManager;
             Logger = NullLogger.Instance;
         }
 
         public ILogger Logger { get; set; }
 
-        public void Process(ScheduledTaskContext context) {
+        public override void Process(ScheduledTaskContext context) {
             if (context.Task.TaskType == "Unpublish") {
                 Logger.Information("Unpublishing item #{0} version {1} scheduled at {2} utc",
                     context.Task.ContentItem.Id,
                     context.Task.ContentItem.Version,
                     context.Task.ScheduledUtc);
 
+                SetCurrentUser(context.Task.ContentItem);
                 _contentManager.Unpublish(context.Task.ContentItem);
             }
         }
diff --git a/src/Orchard.Web/Modules/Orchard.Blogs/Commands/BlogCommands.cs b/src/Orchard.Web/Modules/Orchard.Blogs/Commands/BlogCommands.cs
index 0940393d8..8164f42c9 100644
--- a/src/Orchard.Web/Modules/Orchard.Blogs/Commands/BlogCommands.cs
+++ b/src/Orchard.Web/Modules/Orchard.Blogs/Commands/BlogCommands.cs
@@ -53,12 +53,11 @@ namespace Orchard.Blogs.Commands {
             var owner = _membershipService.GetUser(Owner);
 
             if ( owner == null ) {
-                Context.Output.WriteLine();
-                return T("Invalid username: {0}", Owner).Text;
+                throw new OrchardException(T("Invalid username: {0}", Owner));
             }
 
             if(!IsSlugValid(Slug)) {
-                return "Invalid Slug provided. Blog creation failed.";    
+                throw new OrchardException(T("Invalid Slug provided. Blog creation failed."));
             }
 
             var blog = _contentManager.New("Blog");
@@ -83,8 +82,7 @@ namespace Orchard.Blogs.Commands {
             var owner = _membershipService.GetUser(Owner);
 
             if(owner == null) {
-                Context.Output.WriteLine();
-                return T("Invalid username: {0}", Owner).Text;
+                throw new OrchardException(T("Invalid username: {0}", Owner));
             }
 
             XDocument doc;
@@ -95,14 +93,13 @@ namespace Orchard.Blogs.Commands {
                 Context.Output.WriteLine("Found {0} items", doc.Descendants("item").Count());
             }
             catch ( Exception ex ) {
-                Context.Output.WriteLine(T("An error occured while loading the file: " + ex.Message));
-                return "Import terminated.";
+                throw new OrchardException(T("An error occured while loading the file: {0}", ex.Message));
             }
 
             var blog = _blogService.Get(Slug);
 
             if ( blog == null ) {
-                return "Blog not found at specified slug: " + Slug;
+                throw new OrchardException(T("Blog not found at specified slug: {0}", Slug));
             }
 
             foreach ( var item in doc.Descendants("item") ) {
@@ -122,7 +119,6 @@ namespace Orchard.Blogs.Commands {
                 }
             }
 
-
             return "Import feed completed.";
         }
 
diff --git a/src/Orchard.Web/Modules/Orchard.CodeGeneration/Commands/CodeGenerationCommands.cs b/src/Orchard.Web/Modules/Orchard.CodeGeneration/Commands/CodeGenerationCommands.cs
index 2a43f4c05..b0c561845 100644
--- a/src/Orchard.Web/Modules/Orchard.CodeGeneration/Commands/CodeGenerationCommands.cs
+++ b/src/Orchard.Web/Modules/Orchard.CodeGeneration/Commands/CodeGenerationCommands.cs
@@ -48,15 +48,14 @@ namespace Orchard.CodeGeneration.Commands {
 
         [CommandHelp("codegen datamigration <feature-name> \r\n\t" + "Create a new Data Migration class")]
         [CommandName("codegen datamigration")]
-        public bool CreateDataMigration(string featureName) {
+        public void CreateDataMigration(string featureName) {
             Context.Output.WriteLine(T("Creating Data Migration for {0}", featureName));
 
             ExtensionDescriptor extensionDescriptor = _extensionManager.AvailableExtensions().FirstOrDefault(extension => DefaultExtensionTypes.IsModule(extension.ExtensionType) &&
                                                                                                              extension.Features.Any(feature => String.Equals(feature.Id, featureName, StringComparison.OrdinalIgnoreCase)));
 
             if (extensionDescriptor == null) {
-                Context.Output.WriteLine(T("Creating data migration failed: target Feature {0} could not be found.", featureName));
-                return false;
+                throw new OrchardException(T("Creating data migration failed: target Feature {0} could not be found.", featureName));
             }
 
             string dataMigrationFolderPath = HostingEnvironment.MapPath("~/Modules/" + extensionDescriptor.Id + "/");
@@ -69,8 +68,7 @@ namespace Orchard.CodeGeneration.Commands {
             }
 
             if (File.Exists(dataMigrationFilePath)) {
-                Context.Output.WriteLine(T("Data migration already exists in target Module {0}.", extensionDescriptor.Id));
-                return false;
+                throw new OrchardException(T("Data migration already exists in target Module {0}.", extensionDescriptor.Id));
             }
 
             List<SchemaCommand> commands = _schemaCommandGenerator.GetCreateFeatureCommands(featureName, false).ToList();
@@ -104,25 +102,20 @@ namespace Orchard.CodeGeneration.Commands {
             File.WriteAllText(moduleCsProjPath, projectFileText);
             TouchSolution(Context.Output);
             Context.Output.WriteLine(T("Data migration created successfully in Module {0}", extensionDescriptor.Id));
-
-            return true;
         }
 
         [CommandHelp("codegen module <module-name> [/IncludeInSolution:true|false]\r\n\t" + "Create a new Orchard module")]
         [CommandName("codegen module")]
         [OrchardSwitches("IncludeInSolution")]
-        public bool CreateModule(string moduleName) {
+        public void CreateModule(string moduleName) {
             Context.Output.WriteLine(T("Creating Module {0}", moduleName));
 
             if ( _extensionManager.AvailableExtensions().Any(extension => String.Equals(moduleName, extension.Name, StringComparison.OrdinalIgnoreCase)) ) {
-                Context.Output.WriteLine(T("Creating Module {0} failed: a module of the same name already exists", moduleName));
-                return false;
+                throw new OrchardException(T("Creating Module {0} failed: a module of the same name already exists", moduleName));
             }
 
             IntegrateModule(moduleName);
             Context.Output.WriteLine(T("Module {0} created successfully", moduleName));
-
-            return true;
         }
 
         [CommandName("codegen theme")]
@@ -131,20 +124,18 @@ namespace Orchard.CodeGeneration.Commands {
         public void CreateTheme(string themeName) {
             Context.Output.WriteLine(T("Creating Theme {0}", themeName));
             if (_extensionManager.AvailableExtensions().Any(extension => String.Equals(themeName, extension.Id, StringComparison.OrdinalIgnoreCase))) {
-                Context.Output.WriteLine(T("Creating Theme {0} failed: an extention of the same name already exists", themeName));
+                throw new OrchardException(T("Creating Theme {0} failed: an extention of the same name already exists", themeName));
             }
-            else {
-                if (!string.IsNullOrEmpty(BasedOn)) {
-                    if (!_extensionManager.AvailableExtensions().Any(extension =>
-                        string.Equals(extension.ExtensionType, DefaultExtensionTypes.Theme, StringComparison.OrdinalIgnoreCase) &&
-                        string.Equals(BasedOn, extension.Id, StringComparison.OrdinalIgnoreCase))) {
-                        Context.Output.WriteLine(T("Creating Theme {0} failed: base theme named {1} was not found.", themeName, BasedOn));
-                        return;
-                    }
+
+            if (!string.IsNullOrEmpty(BasedOn)) {
+                if (!_extensionManager.AvailableExtensions().Any(extension =>
+                    string.Equals(extension.ExtensionType, DefaultExtensionTypes.Theme, StringComparison.OrdinalIgnoreCase) &&
+                    string.Equals(BasedOn, extension.Id, StringComparison.OrdinalIgnoreCase))) {
+                    throw new OrchardException(T("Creating Theme {0} failed: base theme named {1} was not found.", themeName, BasedOn));
                 }
-                IntegrateTheme(themeName, BasedOn);
-                Context.Output.WriteLine(T("Theme {0} created successfully", themeName));
             }
+            IntegrateTheme(themeName, BasedOn);
+            Context.Output.WriteLine(T("Theme {0} created successfully", themeName));
         }
 
         [CommandHelp("codegen controller <module-name> <controller-name>\r\n\t" + "Create a new Orchard controller in a module")]
@@ -156,8 +147,7 @@ namespace Orchard.CodeGeneration.Commands {
                                                                                                              string.Equals(moduleName, extension.Name, StringComparison.OrdinalIgnoreCase));
 
             if (extensionDescriptor == null) {
-                Context.Output.WriteLine(T("Creating Controller {0} failed: target Module {1} could not be found.", controllerName, moduleName));
-                return;
+                throw new OrchardException(T("Creating Controller {0} failed: target Module {1} could not be found.", controllerName, moduleName));
             }
 
             string moduleControllersPath = HostingEnvironment.MapPath("~/Modules/" + extensionDescriptor.Id + "/Controllers/");
@@ -169,8 +159,7 @@ namespace Orchard.CodeGeneration.Commands {
                 Directory.CreateDirectory(moduleControllersPath);
             }
             if (File.Exists(controllerPath)) {
-                Context.Output.WriteLine(T("Controller {0} already exists in target Module {1}.", controllerName, moduleName));
-                return;
+                throw new OrchardException(T("Controller {0} already exists in target Module {1}.", controllerName, moduleName));
             }
 
             string controllerText = File.ReadAllText(templatesPath + "Controller.txt");
diff --git a/src/Orchard.Web/Modules/Orchard.Comments/Permissions.cs b/src/Orchard.Web/Modules/Orchard.Comments/Permissions.cs
index 67500ac71..6368d4d34 100644
--- a/src/Orchard.Web/Modules/Orchard.Comments/Permissions.cs
+++ b/src/Orchard.Web/Modules/Orchard.Comments/Permissions.cs
@@ -26,13 +26,17 @@ namespace Orchard.Comments {
                     Name = "Anonymous",
                     Permissions = new[] {AddComment}
                 },
+                new PermissionStereotype {
+                    Name = "Authenticated",
+                    Permissions = new[] {AddComment}
+                },
                 new PermissionStereotype {
                     Name = "Editor",
                     Permissions = new[] {AddComment}
                 },
                 new PermissionStereotype {
                     Name = "Moderator",
-                    Permissions = new[] {AddComment}
+                    Permissions = new[] {ManageComments, AddComment}
                 },
                 new PermissionStereotype {
                     Name = "Author",
diff --git a/src/Orchard.Web/Modules/Orchard.Experimental/Commands/ProfilingCommands.cs b/src/Orchard.Web/Modules/Orchard.Experimental/Commands/ProfilingCommands.cs
index f2729e26f..abd61336d 100644
--- a/src/Orchard.Web/Modules/Orchard.Experimental/Commands/ProfilingCommands.cs
+++ b/src/Orchard.Web/Modules/Orchard.Experimental/Commands/ProfilingCommands.cs
@@ -69,7 +69,7 @@ namespace Orchard.Experimental.Commands {
             for (int i = 0; i < 1000; i++) {
                 var user = _membershipService.CreateUser(new CreateUserParams("user" + i, "1234567", "user" + i + "@orchardproject.net", null, null, true));
                 if (user == null)
-                    return "The authentication provider returned an error";
+                    throw new OrchardException(T("The authentication provider returned an error"));
 
             }
             return "Success";
diff --git a/src/Orchard.Web/Modules/Orchard.Indexing/Commands/IndexingCommands.cs b/src/Orchard.Web/Modules/Orchard.Indexing/Commands/IndexingCommands.cs
index d3295b516..e87d5e983 100644
--- a/src/Orchard.Web/Modules/Orchard.Indexing/Commands/IndexingCommands.cs
+++ b/src/Orchard.Web/Modules/Orchard.Indexing/Commands/IndexingCommands.cs
@@ -38,7 +38,7 @@ namespace Orchard.Indexing.Commands {
         [OrchardSwitches("IndexName")]
         public string Update() {
             if ( !_indexManager.HasIndexProvider() ) {
-                return "No index available";
+                throw new OrchardException(T("No index available"));
             }
             
             var indexName = String.IsNullOrWhiteSpace(IndexName) ? SearchIndexName : IndexName;
@@ -54,7 +54,7 @@ namespace Orchard.Indexing.Commands {
         [OrchardSwitches("IndexName")]
         public string Rebuild() {
             if ( !_indexManager.HasIndexProvider() ) {
-                return "No index available";
+                throw new OrchardException(T("No index available"));
             }
 
             var indexName = String.IsNullOrWhiteSpace(IndexName) ? SearchIndexName : IndexName;
@@ -71,7 +71,7 @@ namespace Orchard.Indexing.Commands {
         [OrchardSwitches("Query,IndexName")]
         public string Search() {
             if ( !_indexManager.HasIndexProvider() ) {
-                return "No index available";
+                throw new OrchardException(T("No index available"));
             }
             var indexName = String.IsNullOrWhiteSpace(IndexName) ? SearchIndexName : IndexName;
             var searchBuilder = _indexManager.GetSearchIndexProvider().CreateSearchBuilder(indexName);
@@ -99,7 +99,7 @@ namespace Orchard.Indexing.Commands {
         [OrchardSwitches("IndexName")]
         public string Stats() {
             if ( !_indexManager.HasIndexProvider() ) {
-                return "No index available";
+                throw new OrchardException(T("No index available"));
             }
             var indexName = String.IsNullOrWhiteSpace(IndexName) ? SearchIndexName : IndexName;
             Context.Output.WriteLine("Number of indexed documents: {0}", _indexManager.GetSearchIndexProvider().NumDocs(indexName));
@@ -112,7 +112,7 @@ namespace Orchard.Indexing.Commands {
         public string Refresh() {
             int contentItemId;
             if ( !int.TryParse(ContentItemId, out contentItemId) ) {
-                return "Invalid content item id. Not an integer.";
+                throw new OrchardException(T("Invalid content item id. Not an integer."));
             }
 
             var contentItem = _contentManager.Get(contentItemId);
@@ -127,7 +127,7 @@ namespace Orchard.Indexing.Commands {
         public string Delete() {
             int contenItemId;
             if(!int.TryParse(ContentItemId, out contenItemId)) {
-                return "Invalid content item id. Not an integer.";
+                throw new OrchardException(T("Invalid content item id. Not an integer."));
             }
             
             var contentItem = _contentManager.Get(contenItemId);
diff --git a/src/Orchard.Web/Modules/Orchard.Media/Views/Admin/Index.cshtml b/src/Orchard.Web/Modules/Orchard.Media/Views/Admin/Index.cshtml
index 564bd58ff..3342410bb 100644
--- a/src/Orchard.Web/Modules/Orchard.Media/Views/Admin/Index.cshtml
+++ b/src/Orchard.Web/Modules/Orchard.Media/Views/Admin/Index.cshtml
@@ -3,7 +3,7 @@
 
 <h1>@Html.TitleForPage(T("Manage Media Folders").ToString())</h1>
     @Html.ValidationSummary()
-
+	@using (Html.BeginFormAntiForgeryPost()) { 
     <fieldset class="bulk-actions">
         <label for="publishActions">@T("Actions:")</label>
         <select id="Select1" name="publishActions">
@@ -49,4 +49,5 @@
             </tr>
             }
         </table>
-    </fieldset>
\ No newline at end of file
+    </fieldset>
+	}
\ No newline at end of file
diff --git a/src/Orchard.Web/Modules/Orchard.Packaging/Commands/PackagingCommands.cs b/src/Orchard.Web/Modules/Orchard.Packaging/Commands/PackagingCommands.cs
index 118458cca..1fb15ead8 100644
--- a/src/Orchard.Web/Modules/Orchard.Packaging/Commands/PackagingCommands.cs
+++ b/src/Orchard.Web/Modules/Orchard.Packaging/Commands/PackagingCommands.cs
@@ -28,8 +28,7 @@ namespace Orchard.Packaging.Commands {
         public void CreatePackage(string extensionName, string path) {
             var packageData = _packageManager.Harvest(extensionName);
             if (packageData == null) {
-                Context.Output.WriteLine(T("Module or Theme \"{0}\" does not exist in this Orchard installation.", extensionName));
-                return;
+                throw new OrchardException(T("Module or Theme \"{0}\" does not exist in this Orchard installation.", extensionName));
             }
 
             // append "Orchard.[ExtensionType]" to prevent conflicts with other packages (e.g, TinyMce, jQuery, ...)
@@ -79,7 +78,7 @@ namespace Orchard.Packaging.Commands {
             }
             catch(Exception e) {
                 // Exceptions area thrown by NuGet as error messages
-                Context.Output.WriteLine(HttpUtility.HtmlDecode(T("Could not unintall the package: {0}", e.Message).Text));
+                throw new OrchardException(T(HttpUtility.HtmlDecode(T("Could not unintall the package: {0}", e.Message).Text)));
             }
 
         }
diff --git a/src/Orchard.Web/Modules/Orchard.PublishLater/Handlers/PublishingTaskHandler.cs b/src/Orchard.Web/Modules/Orchard.PublishLater/Handlers/PublishingTaskHandler.cs
index 6d2120c73..80ed2b1ef 100644
--- a/src/Orchard.Web/Modules/Orchard.PublishLater/Handlers/PublishingTaskHandler.cs
+++ b/src/Orchard.Web/Modules/Orchard.PublishLater/Handlers/PublishingTaskHandler.cs
@@ -1,27 +1,29 @@
 using JetBrains.Annotations;
 using Orchard.ContentManagement;
+using Orchard.Core.Common.Scheduling;
 using Orchard.Logging;
 using Orchard.Tasks.Scheduling;
 
 namespace Orchard.PublishLater.Handlers {
     [UsedImplicitly]
-    public class PublishingTaskHandler : IScheduledTaskHandler {
+    public class PublishingTaskHandler : OwnedScheduledTaskHandler {
         private readonly IContentManager _contentManager;
 
-        public PublishingTaskHandler(IContentManager contentManager) {
+        public PublishingTaskHandler(IContentManager contentManager, IOrchardServices orchardServices) : base(orchardServices) {
             _contentManager = contentManager;
             Logger = NullLogger.Instance;
         }
 
         public ILogger Logger { get; set; }
 
-        public void Process(ScheduledTaskContext context) {
+        public override void Process(ScheduledTaskContext context) {
             if (context.Task.TaskType == "Publish") {
                 Logger.Information("Publishing item #{0} version {1} scheduled at {2} utc",
                     context.Task.ContentItem.Id,
                     context.Task.ContentItem.Version,
                     context.Task.ScheduledUtc);
 
+                SetCurrentUser(context.Task.ContentItem);
                 _contentManager.Publish(context.Task.ContentItem);
             }
         }
diff --git a/src/Orchard.Web/Modules/Orchard.Users/Commands/UserCommands.cs b/src/Orchard.Web/Modules/Orchard.Users/Commands/UserCommands.cs
index 61103becc..1337b6924 100644
--- a/src/Orchard.Web/Modules/Orchard.Users/Commands/UserCommands.cs
+++ b/src/Orchard.Web/Modules/Orchard.Users/Commands/UserCommands.cs
@@ -30,19 +30,20 @@ namespace Orchard.Users.Commands {
         [CommandHelp("user create /UserName:<username> /Password:<password> /Email:<email>\r\n\t" + "Creates a new User")]
         [OrchardSwitches("UserName,Password,Email")]
         public string Create() {
-            string userUnicityMessage = _userService.VerifyUserUnicity(UserName, Email);
-            if (userUnicityMessage != null) {
-                return userUnicityMessage;
+            if (!_userService.VerifyUserUnicity(UserName, Email)) {
+                throw new OrchardException(T("User with that username and/or email already exists."));
             }
+
             if (Password == null || Password.Length < MinPasswordLength) {
-                return T("You must specify a password of {0} or more characters.", MinPasswordLength).ToString();
+                throw new OrchardException(T("You must specify a password of {0} or more characters.", MinPasswordLength));
             }
 
             var user = _membershipService.CreateUser(new CreateUserParams(UserName, Password, Email, null, null, true));
-            if (user != null)
-                return T("User created successfully").ToString();
-            
-            return T("The authentication provider returned an error").ToString();
+            if (user == null) {
+                throw new OrchardException(T("The authentication provider returned an error"));
+            }
+
+            return T("User created successfully").ToString();
         }
 
         int MinPasswordLength {
diff --git a/src/Orchard.Web/Modules/Orchard.Users/Controllers/AccountController.cs b/src/Orchard.Web/Modules/Orchard.Users/Controllers/AccountController.cs
index a638e1118..bc53029ca 100644
--- a/src/Orchard.Web/Modules/Orchard.Users/Controllers/AccountController.cs
+++ b/src/Orchard.Web/Modules/Orchard.Users/Controllers/AccountController.cs
@@ -333,9 +333,8 @@ namespace Orchard.Users.Controllers {
             if (!validate)
                 return false;
 
-            string userUnicityMessage = _userService.VerifyUserUnicity(userName, email);
-            if (userUnicityMessage != null) {
-                ModelState.AddModelError("userExists", T(userUnicityMessage));
+            if (!_userService.VerifyUserUnicity(userName, email)) {
+                ModelState.AddModelError("userExists", T("User with that username and/or email already exists."));
             }
             if (password == null || password.Length < MinPasswordLength) {
                 ModelState.AddModelError("password", T("You must specify a password of {0} or more characters.", MinPasswordLength));
diff --git a/src/Orchard.Web/Modules/Orchard.Users/Controllers/AdminController.cs b/src/Orchard.Web/Modules/Orchard.Users/Controllers/AdminController.cs
index 20f91fa65..9da562383 100644
--- a/src/Orchard.Web/Modules/Orchard.Users/Controllers/AdminController.cs
+++ b/src/Orchard.Web/Modules/Orchard.Users/Controllers/AdminController.cs
@@ -77,9 +77,8 @@ namespace Orchard.Users.Controllers {
                 return new HttpUnauthorizedResult();
 
             if (!string.IsNullOrEmpty(createModel.UserName)) {
-                string userExistsMessage = _userService.VerifyUserUnicity(createModel.UserName, createModel.Email);
-                if (userExistsMessage != null) {
-                    AddModelError("NotUniqueUserName", T(userExistsMessage));
+                if (!_userService.VerifyUserUnicity(createModel.UserName, createModel.Email)) {
+                    AddModelError("NotUniqueUserName", T("User with that username and/or email already exists."));
                 }
             }
 
@@ -139,9 +138,8 @@ namespace Orchard.Users.Controllers {
 
             var editModel = new UserEditViewModel {User = user};
             if (TryUpdateModel(editModel)) {
-                string userExistsMessage = _userService.VerifyUserUnicity(id, editModel.UserName, editModel.Email);
-                if (userExistsMessage != null) {
-                    AddModelError("NotUniqueUserName", T(userExistsMessage));
+                if (!_userService.VerifyUserUnicity(id, editModel.UserName, editModel.Email)) {
+                    AddModelError("NotUniqueUserName", T("User with that username and/or email already exists."));
                 }
                 else {
                     // also update the Super user if this is the renamed account
diff --git a/src/Orchard.Web/Modules/Orchard.Users/Services/IUserService.cs b/src/Orchard.Web/Modules/Orchard.Users/Services/IUserService.cs
index acd7a211f..b42b78af3 100644
--- a/src/Orchard.Web/Modules/Orchard.Users/Services/IUserService.cs
+++ b/src/Orchard.Web/Modules/Orchard.Users/Services/IUserService.cs
@@ -2,8 +2,8 @@ using Orchard.Security;
 using System;
 namespace Orchard.Users.Services {
     public interface IUserService : IDependency {
-        string VerifyUserUnicity(string userName, string email);
-        string VerifyUserUnicity(int id, string userName, string email);
+        bool VerifyUserUnicity(string userName, string email);
+        bool VerifyUserUnicity(int id, string userName, string email);
 
         void SendChallengeEmail(IUser user, Func<string, string> createUrl);
         IUser ValidateChallenge(string challengeToken);
diff --git a/src/Orchard.Web/Modules/Orchard.Users/Services/UserService.cs b/src/Orchard.Web/Modules/Orchard.Users/Services/UserService.cs
index 1355e48e0..6b84fb063 100644
--- a/src/Orchard.Web/Modules/Orchard.Users/Services/UserService.cs
+++ b/src/Orchard.Web/Modules/Orchard.Users/Services/UserService.cs
@@ -36,7 +36,7 @@ namespace Orchard.Users.Services {
 
         public ILogger Logger { get; set; }
 
-        public string VerifyUserUnicity(string userName, string email) {
+        public bool VerifyUserUnicity(string userName, string email) {
             string normalizedUserName = userName.ToLower();
 
             if (_contentManager.Query<UserPart, UserPartRecord>()
@@ -44,13 +44,13 @@ namespace Orchard.Users.Services {
                                           user.NormalizedUserName == normalizedUserName || 
                                           user.Email == email)
                                    .List().Any()) {
-                return "User with that username and/or email already exists.";
+                return false;
             }
 
-            return null;
+            return true;
         }
 
-        public string VerifyUserUnicity(int id, string userName, string email) {
+        public bool VerifyUserUnicity(int id, string userName, string email) {
             string normalizedUserName = userName.ToLower();
 
             if (_contentManager.Query<UserPart, UserPartRecord>()
@@ -58,10 +58,10 @@ namespace Orchard.Users.Services {
                                           user.NormalizedUserName == normalizedUserName ||
                                           user.Email == email)
                                    .List().Any(user => user.Id != id)) {
-                return "User with that username and/or email already exists.";
+                return false;
             }
 
-            return null;
+            return true;
         }
 
         public string CreateNonce(IUser user, TimeSpan delay) {
diff --git a/src/Orchard.Web/Modules/Orchard.Widgets/Services/WidgetsService.cs b/src/Orchard.Web/Modules/Orchard.Widgets/Services/WidgetsService.cs
index 0f61ea598..77e1dfcef 100644
--- a/src/Orchard.Web/Modules/Orchard.Widgets/Services/WidgetsService.cs
+++ b/src/Orchard.Web/Modules/Orchard.Widgets/Services/WidgetsService.cs
@@ -43,7 +43,7 @@ namespace Orchard.Widgets.Services {
         public IEnumerable<string> GetZones() {
             return _featureManager.GetEnabledFeatures()
                 .Select(x => x.Extension)
-                .Where(x => DefaultExtensionTypes.IsTheme(x.ExtensionType))
+                .Where(x => DefaultExtensionTypes.IsTheme(x.ExtensionType) && x.Zones != null)
                 .SelectMany(x => x.Zones.Split(','))
                 .Distinct()
                 .Select(x => x.Trim())
diff --git a/src/Orchard/Commands/CommandHostAgent.cs b/src/Orchard/Commands/CommandHostAgent.cs
index 46e7e4254..3c54ed1f4 100644
--- a/src/Orchard/Commands/CommandHostAgent.cs
+++ b/src/Orchard/Commands/CommandHostAgent.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Reflection;
 using System.Web.Mvc;
 using System.Web.Routing;
 using Autofac;
@@ -99,6 +100,12 @@ namespace Orchard.Commands {
                 return CommandReturnCodes.Retry;
             }
             catch (Exception e) {
+                if (e is TargetInvocationException && 
+                    e.InnerException != null) {
+                    // If this is an exception coming from reflection and there is an innerexception which is the actual one, redirect
+                    e = e.InnerException;
+                }
+
                 OutputException(output, T("Error executing command \"{0}\"", string.Join(" ", args)), e);
                 return CommandReturnCodes.Fail;
             }
@@ -138,7 +145,6 @@ namespace Orchard.Commands {
             // Display header
             output.WriteLine();
             output.WriteLine(T("{0}", title));
-            output.WriteLine(T("--------------------------------------------------------------------------------"));
 
             // Push exceptions in a stack so we display from inner most to outer most
             var errors = new Stack<Exception>();
@@ -148,18 +154,26 @@ namespace Orchard.Commands {
 
             // Display inner most exception details
             exception = errors.Peek();
+            output.WriteLine(T("--------------------------------------------------------------------------------"));
+            output.WriteLine();
             output.WriteLine(T("{0}", exception.Message));
             output.WriteLine();
-            output.WriteLine(T("Exception Details: {0}: {1}", exception.GetType().FullName, exception.Message));
-            output.WriteLine();
-            output.WriteLine(T("Stack Trace:"));
-            output.WriteLine();
 
-            // Display exceptions from inner most to outer most
-            foreach(var error in errors) {
-                output.WriteLine(T("[{0}: {1}]", error.GetType().Name, error.Message));
-                output.WriteLine(T("{0}", error.StackTrace));
+            if (!((exception is OrchardException ||
+                exception is OrchardCoreException) &&
+                exception.InnerException == null)) {
+
+                output.WriteLine(T("Exception Details: {0}: {1}", exception.GetType().FullName, exception.Message));
                 output.WriteLine();
+                output.WriteLine(T("Stack Trace:"));
+                output.WriteLine();
+
+                // Display exceptions from inner most to outer most
+                foreach (var error in errors) {
+                    output.WriteLine(T("[{0}: {1}]", error.GetType().Name, error.Message));
+                    output.WriteLine(T("{0}", error.StackTrace));
+                    output.WriteLine();
+                }
             }
 
             // Display footer