this should now really fix #1787

Author: punker76

MahApps.Metro/Controls/WindowSettings.cs

@@ -56,15 +56,21 @@ public WINDOWPLACEMENT? Placement {
             }
         }
 
-        private bool upgradeSettings = true;
-        
         /// <summary>
         /// Upgrades the application settings on loading.
         /// </summary>
+        [UserScopedSetting]
         public bool UpgradeSettings
         {
-            get { return upgradeSettings; }
-            set { upgradeSettings = value; }
+            get
+            {
+                if (this["UpgradeSettings"] != null)
+                {
+                    return (bool)this["UpgradeSettings"];
+                }
+                return true;
+            }
+            set { this["UpgradeSettings"] = value; }
         }
     }
 

samples/MetroDemo/ExampleWindows/FlyoutDemo.xaml.cs

@@ -23,6 +23,15 @@ public FlyoutDemo()
                         e.Cancel = true;
                     }
                 };
+
+            var mainWindow = (MetroWindow)this;
+            var windowPlacementSettings = mainWindow.GetWindowPlacementSettings();
+            if (windowPlacementSettings.UpgradeSettings)
+            {
+                windowPlacementSettings.Upgrade();
+                windowPlacementSettings.UpgradeSettings = false;
+                windowPlacementSettings.Save();
+            }
         }
 
         public void Launch()