Hmmmm... I have been using the 175.16 driver since it was released recently.. and Um... PoserPro has been as stable as a rock... no OpenGL issues, no Poser crashing issues... nothing at all to complain about... oh... system is... nVidia GeForce 8800 GTX graphics card Windows Vista Ultimate 64bit INTEL Quadcore Extreme2 Processor PoserPro 64bit Firefly I'm no help eh...