I'm assuming this has something to do with my computer, but I can't find anything about this specific problem anywhere. When I try to start a server (max players set to 1, Private), any map I load has major clipping issues. It is not a problem with my VMF files because it happened when I just tried to sort of "explore" Valve maps. Player characters either float when walking off ledges or clip right through models. Since this happens even with the maps that came packed with the game, I'm concerned that I won't be able to test my own map for bugs in time to release it for the upcoming contest. Has anyone else had a similar problem?