I don't know if this is a issue of the game or of the GPU driver, so I'll submit it to both in the hope they'll short-circuit to fix this.
I see various rendering issues, showing things (like walls) that aren't really there, don't showing things that are there and so on. Here some images:
This is with a Radeon HD 6950 with the newest (13.3-beta3) catalyst. Older driver versions are affected, too, but I can't tell when it started.