Valve has once again patched Left 4 Dead on Steam, fixing some minor problems.The patch, which should be automatically installed when you log onto Steam, fixes the following:Removed a survival related command exploitAchievements with multiple critera [sic] can now be expanded to show progressmp_gamemode is now included with other console variables for server loggingThis comes after the release of the Survival Pack for Left 4 Dead, which unsurprisingly added a survival mode to the game.This is the second patch following the launch of the Survival Pack.