Yeah, I have the same problem, except the video disappeares whenever I go fullscreen through WinMedia player. When I use my DVD player/3rd party video players like ATI's multimedia center or CoreMediaPlayer, the screen is completely black no matter what. The audio streams normally. This problem does not occur under Explorer shell running.

I am a bit baffled by this, but I won't give up until I find a source of this problem & fix it ^_^

Any help/suggestions would be very helpful too...