I agree Poser Pro runs smoother under Vista x64, no doubt about it at all. Faster, too. As I already mentioned, I have a dual boot with XP x64, and there's no question that the OpenGL performance is quicker and smoother in Vista, even with Aero turned on. But, it won't crash in XP with the same card and the Nvidia XP 64 bit drivers.

The problem is something to do with how Poser deals with OpenGL, and how the 64 bit drivers for Vista are running OpenGL. Each new driver release from Nvidia for 64 bit Vista has been a little bit better than the previous, so this too shall pass, eventually.