Vanilla loads correct? Have you tried loading all of the maps? Have you tried local vs online server? Sorry Im not much help, im just trying to reduce the amount of variables. Normally when this happens we recommend that you.
a. have ur settings on at least medium
b. clear your shaders cache
c. make sure you are playing normal FS mp conquest not sp
d. some people can only play online, not locally; we don't know why even some devs are in this boat
Im gonna search to see if others had this issue and what helped...........* looks in records.........

Someone tell Bandu Ron Paul won't win!