Speedinlight

Hi all, it will be great if you lots can give me some help/advice on the problem I have come across on the gcftw l4d2 server. Problem is that I can join the server and play a match but when it finished and loadup to a new campaign my game will freeze and need a force close. Strangely it only happens when I join this particular server, no problem whatsoever in other server. I have tried verify the game, uninstall and reinstall the game and steam but it doesn't seem to fix the problem, it shouldn't be a problem with my pc or system as I have just format and reinstall everything few days ago. My steam id is Speedinlight and I really hope someone here can help and come up with a solution! Many thanks! PS: sorry for my poor English, not a native speaker here!