Hi, I sometimes have a weird problem during single palyer, if I change from a area to another it may happen some textures turn white blue lines on walls, floor or doors... I can't understand why, but sometimes I just quickload and everything turns ok and sometimes it desn't. When I had a GEForce MMX 440 it ran smoothly, now I have a Radeon 9200 (I think) and sometimes i get queasy (especially where it should be dark, these wrong textures GLOW).
I have the PC version updated to 1.00
make sure you have latest drivers, try lower graphic settings.