Hey guys, So, I've had L4D for a while, and it have been running fine. Lag free, great sounds looks awesome. But recently, my menu has screwed up, and the Co-Op button says: "#L4D360UI_MainMenu_HoldoutCoop" And whenever I try to go into game, it'll finish loading, and just stop, and disappear and go back to the desktop. Any ideas on how to fix this? Thanks