I think it may have been because my computer had to restart, not sure.
Either way it works.

It fixed itself, I closed Left 4 Dead and my computer blue screened (run games in window mode, Steam likes to error when you X them out).

Great game, I really enjoy it .

I have read the threads on other people with this problem, and only solution I have found is to adjust the preferences.txt and that didn't work. My debug.txt is also much shorter than other peoples. 8400GS, Vista 32-bit. Bought off Steam Multiwinia steam.1.2.3 built Nov 26 2008 WinSock started Loadi...