Updates to Left 4 Dead Demo have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:
Left 4 Dead Demo
Fixed a bug where the connection to a server would get stuck in a looping state
Made sv_steamgroup_exclusive not connect to matchmaking. Removed sv_unreserve, private servers should sv_steamgroup_exclusive now
Improved the speed in finding a game lobbyFixed a bug that could cause you to search for a game lobby indefinitely