It's a tesselation issue: AMD Optimzed does not work anymore in Crysis 2 DX11 Ultra.
You get yellow? I got flat white (outdoors) and black (indoors), at all spots (piles of rubble, brick walls) where tesselated textures were now totally absent.
If you use the AMD uninstall tool (like i did) before installing Catalyst, your previous settings are erased too. Hence in CCC, Tesselation will be set at factory default, which is "AMD optimized". Just set it to "Application controlled". Problem solved!
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Last edited by Blín D'ñero : Sep 8, 2013 at 10:27 PM.