Fixes: U4-4419 TempData is not being cleared on RedirectToCurrentUmbracoPage - it actually shouldn't be cleared but we need to handle how we add it properly as tempdata only clears when it is read

src/Umbraco.Web/Controllers/UmbLoginController.cs

@@ -32,9 +32,9 @@ namespace Umbraco.Web.Controllers
             }
 
             //redirect to current page by default
-            TempData.Add("LoginSuccess", true);
-            //return RedirectToCurrentUmbracoPage();
-            return RedirectToCurrentUmbracoUrl();
+            TempData["LoginSuccess"] = true;
+            return RedirectToCurrentUmbracoPage();
+            //return RedirectToCurrentUmbracoUrl();
         }
     }
 }

src/Umbraco.Web/Controllers/UmbLoginStatusController.cs

@@ -30,7 +30,7 @@ namespace Umbraco.Web.Controllers
             }
 
             //redirect to current page by default
-            TempData.Add("LogoutSuccess", true);
+            TempData["LogoutSuccess"] = true;            
             return RedirectToCurrentUmbracoPage();
         }
     }

src/Umbraco.Web/Controllers/UmbProfileController.cs

@@ -41,7 +41,7 @@ namespace Umbraco.Web.Controllers
             }
 
             //redirect to current page by default
-            TempData.Add("ProfileUpdateSuccess", true);
+            TempData["ProfileUpdateSuccess"] = true;            
             return RedirectToCurrentUmbracoPage();
         }
     }

src/Umbraco.Web/Controllers/UmbRegisterController.cs

@@ -33,7 +33,7 @@ namespace Umbraco.Web.Controllers
                         return Redirect(model.RedirectUrl);
                     }
                     //redirect to current page by default
-                    TempData.Add("FormSuccess", true);
+                    TempData["FormSuccess"] = true;            
                     return RedirectToCurrentUmbracoPage();
                 case MembershipCreateStatus.InvalidUserName:
                     ModelState.AddModelError((model.UsernameIsEmail || model.Username == null)