Just upgraded my vid card to 8800GT and I start getting the artifacts too. It's related to the 16km mod for GWX 2.0, as in stock (8km) GWX2.0 I don't have them.
By replacing files individually, I traced the problem to one of the files in the Env folder, more precisely the Sky.... (something) file - can't remember the precise name, I'm @work now. With the 8 Km (stock GWX2.0) file there's no problem, as soon as I put the 16 Km file the artefacts appear.
If this observation can help anyone in fixing it, here it is: After vid card upgrade, I have the artifacts also in my GWX 1.03 install. I didn't have them until the upgrade (Nvidia 7900GS), so the changes in this file (the Sky... thing) are not 100% to the taste of newer video cards.
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