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Late last year Valve made some server side fixes to prevent Left 4 Dead games taking place on its dedicated servers being over-run by giant players and spawning enemies in safe zones.
Joystiq reports that a fix has now been released to combat similar issues when playing in player-hosted matches, both on Xbox LIVE and via system link. You should be prompted to download the update when you next load up the game.
It’s good to see Valve working to resolve problems which could damage the enjoyment of such a fantastic multiplayer game.