Tried that, didnt work.. I also tried this:
Crash Without Error.
Potential fix for crashes all together : Link
Thanks to : Bishop7
A lot of players are now getting a crash at random without an error message.
Possible fix : put -lv in your game runpath. Warning! This removes all the gore out of the game. Note, this does not solve the issue all together.
Possible fix 2 :
1. Close Steam if running
2. Go to your Steam\Steamapps folder
3. Delete left 4 dead 2 client.ncf
4. Delete client.dll from your steam\steamapps\common\left 4 dead 2\left4dead2\bin folder
5. Start Steam
6. Right click on L4D2 and validate the game
7. After validation is complete, right click on the game and choose Install
8. Let it redownload the file and install it properly
Credit goes out to : atrpunk08
Solved by valve : Unconfirmed.
But I dont even have the client.ncf nor the client.dll anymore..... So couldn't do that..