I wonder what mouse movement has to do with the whole situation and my only idea right now is multi monitors, what if with NVidia only Windows doesn't know which monitor is primary until the mouse is moved in that specific monitor this way windows realizes that the monitor with the mouse within it is the primary one and allows 3D payback on it.
It is a wild guess but worth a try.
Like i said already if i were u @alexdepalma i would completely remove any 2nd monitor connected to my PC and remove NVidia drivers. Shutdown PC (make sure u shutdown so that video BIOS has to re-detect any connected external monitors) and then install latest NVidia drivers.
After that try to play a 3D file.
Another idea i got now is to disable MULTI GPU in BIOS just make sure NVidia is ur only available GPU in device manager.
If u tell me which motherboard u have i can tell u which setting in BIOS u have to disable.
It is a wild guess but worth a try.
Like i said already if i were u @alexdepalma i would completely remove any 2nd monitor connected to my PC and remove NVidia drivers. Shutdown PC (make sure u shutdown so that video BIOS has to re-detect any connected external monitors) and then install latest NVidia drivers.
After that try to play a 3D file.
Another idea i got now is to disable MULTI GPU in BIOS just make sure NVidia is ur only available GPU in device manager.
If u tell me which motherboard u have i can tell u which setting in BIOS u have to disable.