I also have this issue, on top of shimmering textures/shadows/light/brightness (and I've tried everything to make things work), lag and latency issues. Here's my system and benchmark information:

System:
Windows 7 Ultimate 64 bit (6.1, build 7601) Service Pack 1 (7601.win7sp1_gdr.130318-1533)
Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz
16366.664MB
NVIDIA GeForce GTX 690(VRAM 4014 MB) 9.18.0013.2049

Score:14833
Average Framerate:142.526
Performance:Extremely High
-Easily capable of running the game on the highest settings.

Temps:
30-50 degrees Celsius on everything.