yep, I'm at 32bit and I don't believe i have anything with directshow running unless deskscapes is using it but even with deskscapes disabled I still have this effect. It was either the new ATI drivers or windows 7 SP1 that caused it, I haven't installed anything else but I'm getting this same effect on both of my rigs with windows blinds, both with ATi cards and both with windows 7 64bit.