I have recently started getting the same error. However it only happens after a BIS_fnc_playVideo have been used. If I alt-tab after a video have been started with that, I will get that error. I have also tried to run [""] call BIS_fnc_playVideo to stop the video before alt-tabbing, or waited for the video to stop by itself. I still get the black-screen that requires killing it with task manager.