UberZero

Right, well, I read all the posts in the fourm for support, and none of them covered this problem. Whenever I try to start a multiplayer game via the buddylist option, the normal screens and menus appear, but after a split second, they all vanish, as if I were launching the game, but I didn't do anything, no clicking, nadda. Anyhow, I waited for a few minutes, nothing, had to restart my computer =/. So..any ideas on what this is, or how to fix it?