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Once a while, and i'm not sure what the trigger is, when i try to open a window of a program (in this case steam.exe) via the taskbar the taskbar and screen flashes. The best way to explain is that it looks similar to when explorer.exe restarts. It happens quite often. Sorry i cant provide anything too specific, but it happens quite frequently when i try to open a new friend chat when i see it in the taskbar.