When I put the Anti-aliasing above medium the floor, lightsabers, many boxes and crates and more vanish. they are still solid but just invisible. It is like they are completely transparent. I have tried many fixes such as forcing a repair, reinstalling drivers, and even reinstalling the game completely. It has been happening for a while but only on crates and a few walls but now has spread to a lot more noticeable things. Any help much appreciated.