If I were to make a guess, it's probably some problem with the way the information is sent to the graphics card, which could be specific to certain video cards or driver versions. I'm having the same problem with my GeForce 465 GTX, so if it's a general problem with certain NVidia cards or drivers, that would explain the graphical issue.
Specs: Core i7 @ 2.66 GHz, 6GB RAM, Windows 7 64-bit, GeForce 465 GTX (driver version 257.21).
I've attached DxDiag outputs from both the 32-bit and the 64-bit version.
Last edited by Pidgeot; 07/01/2010 at 11:25 am.