i bought killing floor when it first came out on the mac. it worked fine until about a few weeks after i bought it. when ever i start up the game from steam, the game crashes. i dont even get to the main menu. i see the game starting up, and suddenly the game crashes. i tried over and over again, but still it wont work. i have uninstalled and installed killing floor at least 5 times. i dont know what else to do. i contacted steam, and they haven't been the slightest help. one more thing i'd like to point is that killing floor works when i start it up through my apps, but i can't play online. if i were to start it up from steam, then i would be able to play online. when i click multiplayer when i launch it through my apps it says "steam must be running to play this game." please help me. any help is appreciated. i use a nvidia 9400 and 9600gt graphics card. my computer is also perfectly capable of running this game.