yesterday it worked GREAT i love this game , amaing so glad i bout it, buuuut, today when i jumped into a challenge whenever i shot instead of a muzzle flash all i saw was a black cube in its place, same with everyone elses muzzel flash, black cubes were showing up when at people feet when they ran (like it should have been dust) and in other places, what can i do?

I am having the same problem, except my squares are sometimes blue. I have updated drivers, played around with various video quality settings, but nothing makes it better.