Nvidia GeForce 200 series - Rendering Issues after 10.6.4 Update (Mac)
If you recently updated to OSX 10.6.4 and are experiencing issues with Vectorworks renderings if you have the nVidia GeForce 200 series graphics card (specifically OpenGL) these issues have been acknowledged by nVidia and the below links to both a video card driver and CUDA are stated to correct the issue: