Having problems with steamworks

nobody?

Have you tried Steam Support?

Of course you can always go the hard way, uninstall everything (games + steam), download and install again, and see if it works (:

There was a recent Steam Update, if you haven't restarted it in a while may want to do that.

Try to verify game cache/ defragment cache files in game properties yet?

if rebooting doesn't help, try reinstalling steam. don't forget to backup your games before reinstalling, though