KF2 Won't start

I have played around 45 hours of KF2 and i decided to play some more with my friends but when i tried to start the game it says on steam that im playing KF2 and the game is about to start but then it just shuts down and saves to steam cloud.

I have tried restarting steam, my computer and reinstalling the game but nothings seems to work.

Does anyone know how to fix this issue?

P.s Is it possible that Tripwire has accidently banned mehttp://forums.tripwireinteractive.com/images/smilies/eek.gif?

KF2 Won't start