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 Left4Dead 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...

Updates to Left 4 Dead have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:

Versus Mode Changes

    * Tank melee attack can now hit multiple Survivors in one swing
    * Fixed Tank punch being able to hit targets behind walls
    * Fixes to 'Tank parking'. The Tank will now run back and attack the Survivors if he becomes AI due to two players expiring the frustration meter
    * Fixed a case where a Tank frustration meter could run out right as he was in his death animation and he would come back to life
    * Fixed a case where the Tank was moving too slowly while crouching and being shot
    * Tanks now have the possibility of spawning in a slightly different ...

On February 5, 2009, Valve released details about the upcoming downloadable content pack. The two full campaigns of "Death Toll" and "Dead Air" for Versus Mode are included, and a new game mode called "Survival Mode", which was described as the four Survivors trying to survive the longest against waves of the Infected, will be released in the second quarter of 2009.