Which format is this? If xbox, then i don't know, as i hav not experienced that problem before. PC, then i may be able to help you. A friend suffered a similar problem to this, and it turns out some monkey had moved a file (not sure which, or where to) that happened to be the lightsaber combat command thingyjiggy. If it keeps being a bender, you may as just uninstall and reinstall.
Dulce et Decorum Est Pro Patria Mori
Let Mercy Come [/center]