Anyone who is having a graphics problem with artifacts in the sky of the GWX2 16KM Mod and is willing to try a test, I have a 16km mod that uses different envcolors and skycolors files.
Use JSGME to enable it after the GWX 16KM mod and let us know if it fixes your problem. I used it to fix a graphic problem I was having with my Nvidea 7800GS. Be aware that this mod will also lighten up your night sky.
It's about a 1000KB zip file and JSGME ready.
http://files.filefront.com/Marhks+Oc.../fileinfo.html
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GWX 3, JSGME 2.3, Sh3 Commander 3.2 SH3 Gen 8.1, Water Stream for U-boats, LRT LITE 2.0, Lifeboats for SH3