A required update for Left 4 Dead has been released.  Please run hldsupdatetool to receive the update.  The specific changes include:

Game and client changes:

• Introduced fatigue to the melee attack in versus mode. You will see a HUD display when your melee swing is cooling down
• Boomer vomit will now pass through common infected
• Addressed some surround sound detection issues
• Fixed a rare crash when exiting Left 4 Dead on Windows Vista
• Fixed a case where the complete all expert campaigns achievement was not being rewarded

Dedicated server changes:

• Corrected an issue where Windows based dedicated were sending spurious shutdown notifications to the master causing - them to delist temporarily
• Fixed dedicated servers not resetting the versus team swap correctly--you could join a dedicated server that had a - previous game that was swapped and arrive on the other team than what was selected in the lobby
• Renamed the tags for sv_search_key to use "key:" in the server tags instead of "sv_search_key." This should help with issues of the 63 character limit of server tags
• Fixed an occasional server crash related to voting

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