That's really strange. Haven't heard of that problem before. (Any mods installed?)
a) Exit and then re-launch the game from your most recent save. Did that fix the issue?
b) Un-/re-install the game (I know, a real pain. But something is seriously wrong and you can't play as it is, so drastic measures are justified.
c) If you do have to re-install, (and internet usage isn't an issue) I recommend going with the EA/Orgin digital download version. It's about 24GB (for the UE) but the advantages are 1) Never need the physical discs again, and 2) Game info (including product/CD-keys) are stored on the Origin servers and you can retrieve any time.
