It's the prompt for elevation from the secure desktop that does it. Easiest way I've found to resolve it is to ALT + Enter twice to toggle full screen and back.
You *could* disable that prompt - but it's one of the security features implemented to make it harder for programs to make unwanted changes to your system so I'd leave it be and just plan any changes that cause it to occur outside of your play schedule.
-Mcoy
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