I've never had any graphical issues like that playing, so you could try a few things:
Dust your graphics card with compressed air, but be careful not to hold the can upside down, liquid will come out.
Restart the game to see if it happens again
Reinstall the game.
Repatch the game.
Go back to old drivers, if it's an Nvidia card, they say the 84.XX are the most stable.
The game does have quite a few glitches, but the new patch has been problem-free for me so far, except for tank shells not working on hummvee's.