Fixed camera lock up "I think"

Ok i donno if you guys had the same prob but whenb ever i would load up the beta fps map and turn on the memory finer thing then go bak into game ansd press tab i could move arround with wsad but every once and a wile the mouse would lock up. So i changed the fps unit from a marine to a sheep "hope thats ok" and now theres no lock up. Hope i help some.