I've been seeing this periodically, typically in quarries. Right now I'm experiencing it in Thicket Excavations. I previously assisted the fellow there, now I'm returning to it, and it's full of enemies (as expected). However, all of the ramps, and sections of rock walls, are all rendered as blocks and strips of what look like ice. Other persons, and myself, can wander freely through the complex, but if someone is within the blocks of ice, they are not visible until they emerge. It also makes it *very* difficult to enter the area, because I can't see through the ice surfaces, so don't know how far it is down to the next surface.
Also, creatures (including myself) who are *inside* the ice blocks, can see out just fine, which means I'm blind and they aren't, as I enter.
Is there some way to fix this issue???
My system:
Win7 64-bit
NVidia GTX 980 video card, 4GB RAM, current NVidia drivers installed
16GB RAM
Running from Samsung 950 Pro SSD.