I agree, it's something A7 only. I've played a many different games and have never had this problem yet with the exception of A7. So I highly doubt it could be a DirectX bug, if it was, wouldn't every other game out there have this as well?

And I haven't observed it on a non-XP OS, but then again, the large majority of people use XP to play and develop, so that's probably why there is no one reporting it if it does exist on Vista as well.