Index: DamClients/DamUI/trunk/src/Dam/Forms/LocalizedMessageBox.cs
===================================================================
diff -u -r6125 -r6208
--- DamClients/DamUI/trunk/src/Dam/Forms/LocalizedMessageBox.cs	(.../LocalizedMessageBox.cs)	(revision 6125)
+++ DamClients/DamUI/trunk/src/Dam/Forms/LocalizedMessageBox.cs	(.../LocalizedMessageBox.cs)	(revision 6208)
@@ -51,7 +51,10 @@
 
             // Get the product name to use as dialog caption
             string caption = About.Product;
-
+            if (targetObject is Control control && control.InvokeRequired)
+            {
+                return control.Invoke(() =>  MessageBox.Show(control, finalMessage, caption, buttons, icon));
+            }
             return MessageBox.Show(targetObject as IWin32Window, finalMessage, caption, buttons, icon);
         }