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Well, there is no doubt that some UI is being access from a thread different from the thread on which the UI is running.

 In Visual Studio, you can open the Threads window (go to Debug -> Windows -> Threads, at runtime when debugging), which will permit you to see on which thread the different calls to your methods/events are made, and it should help you find out where and when you need to call Invoke, so the calls are redirected on the UI thread.

Imported from legacy forums. Posted by André (had 778 views)