Ensures tempdata is set on our member controllers in the correct place and ensures that the RegisterModel doesn't explicitly set the RedirectUrl because we want it to be empty by default.

src/Umbraco.Web/Controllers/UmbLoginStatusController.cs

@@ -24,6 +24,8 @@ namespace Umbraco.Web.Controllers
                 FormsAuthentication.SignOut();
             }
 
+            TempData["LogoutSuccess"] = true;
+
             //if there is a specified path to redirect to then use it
             if (model.RedirectUrl.IsNullOrWhiteSpace() == false)
             {
@@ -31,7 +33,7 @@ namespace Umbraco.Web.Controllers
             }
 
             //redirect to current page by default
-            TempData["LogoutSuccess"] = true;            
+            
             return RedirectToCurrentUmbracoPage();
         }
     }