JoeHad a similar problem with my old coal burning PC the other day. The problem dissappeared when I redid all my cloud textures to straight 32 bit in Flight Environment (was playing with frame rates, seemed my machine doesn't like DTX3 textures). But if the card isn't overheating I'd suspect that there is a texture in the area that doesn't quite fit. By the way, I got no error messages at all for my problem.Jack