What is wrong with Left 4 Dead 2?

I was playing the game on my PC yesterday and today I was downloading the passing dlc. While I waited I decided to play Dragon Age Origins. Once L4D2 finished I tried to play it and now, every time a map finishes loading the game crashes. Does anyone have any suggestions?What is wrong with Left 4 Dead 2?
Reinstall or if anyone else is having problems they may have a patch soon to fix it. Your not suppose to play games while things are updating.What is wrong with Left 4 Dead 2?
same happen to me ! i reinstall it too but still not working

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What is wrong with Left 4 Dead 2?
L4D 2 was updating I had to restart steam a few times.



L4D 2 works though.



If NOTHING works.



Reinstall the game.