i just got halo for my mac, and when im playing campain, whenever i get hit, my whole screen goes white for a second. and so when i get hit a few times, i cant do anyhting because i cant see anythign at all, untill i stop getting hit. it did this in the demo of halo i had, too. is this a bug in the game? and is there a patch for it? i have a nice computer (macbook pro) so i dont think its my computer. any help?