i7-3610QM
geforce 670M
8gb RAM

Graphic settings: Everything on low or (if possible) off, except:

Clouds on low.
Objects on normal.
VMemory on auto.
VSync off.

Just ran across a field north of Kamenka, once I get to a certain distance, some trees and some bushes turn either black or white (bushes black, trees white). If I get closer, they turn normal again. For the trees, they don't turn back white when I get farther away, some bushes get black again though.

Also, sometimes you only see the black/white stuff when you hold your right mouse button to zoom in. Other times it's the other way around. It's really random. {F28277}