If you have a Mac Pro with a NVIDIA Quadro 4000 video card, and you updated to Mac OS X 10.6.7, you may have noticed that your video isn’t what it used to be. This is because the Mac OS X 10.6.7 update blindly removes the Quadro 4000 driver. The fix is to download and install the latest Quadro Mac OS X driver from NVIDIA’s website (currently release 256).