Hey!
I’ve come across a bug where the renderer stops operating while loading a map. It gets around half way through the map load and then freezes. The game keeps ticking since I can hear the game getting to the lobby and people talking with VOIP etc. It happens maybe 1 in 3 map loads.
I’m running a GTX680 with latest drivers on Windows 7 64-Bit. I do alt-tab a fair bit so maybe that affects it?