Everytime I load a new area and go in, the ground is all squares and the textures aren't correct. If I change the AA setting from whatever it is, to something else, it fixes the corruption. Also if I am running in window mode and change the size of the window, it fixes the problem.
This is with a 6800GT (AGP) with Nvidia drivers 81.85, and 81.87 (beta). It has happened with older driver releases, I just don't remember which versions off the top of my head.
I have all my settings maxed, 4x AA (even though this happens regardless of the AA setting) at 1600x1200.
Here are the screenshots of what I mean.
And fixed:
L
