I get the same problem. Was working fine last night, then I got home from work today, installed today's new update (stable) and its broken. It also looks like the game loads in the wrong resolution, more like 720p instead of 1080p. I tried toggling that resolution setting back and forth and it makes no difference. Then I go into the server list and its empty. As soon as I click cancel it locks up, can still hear the sounds though. And like above, you cannot quit the process, have to force reboot the pc. I also tried everything powfeast did, reinstall etc, no change. <_<