El parche para Left 4 Dead ya está en Steam

General

• Fixed Survivors being able to climb surfaces marked for versus infected only
• Fixed a class of SurvivorBot bugs dealing with rescuing downed players
• Players can no longer grab ladders while flying through the air after a Tank punch
• Shooting near a car with an alarm that has already fired the alarm will no longer make chirping noises
• Improved loading time
• Fixed mini-gun physics exploit
• Fixed propane tanks (and other physics objects) causing players to fall through elevators
• Fixed rare achievement bug issues
• Fixed several map exploits
• Fixed various match making issues
• Fixed NAT traversal issues

Versus Changes

• Added HUD elements to show status of other infected players
• Changed color of infected player name in chat to red
• Fixed exploit where players could spawn infected bots
• Fixed instance where a Survivor changing to the infected team would be attacked by infected bots
• Normalized special infected melee damage
• Made the following client commands cheat protected: "Kill" and "explode"
• Fixed exploit where infected players could run away and teleport back to gain health
• Players can only change teams once per map
• Players can't change teams while other players are still loading
• Tank spawns at the same % through the map for both teams in versus mode
• Made the Tank and Witch spawn directly on the escape route
• Increased chance of getting the Tank or Witch
• Fixed team swap issue

Hunter

• Easier to pounce a Survivor who is meleeing
• Increased Minimum damage a Hunter pounce does

Smoker

• Fixed Smoker tongue tolerance
• Smoker now has to be killed or the tongue destroyed for the tongue to break
• Survivors cannot bash someone off the tongue until the Survivor being pulled is paralyzed or hanging
• Tongue attacks that fail to paralyze or hang a Survivor will use the shorter ability delay timer
• Fixed cases where the ability timer was not using the correct time
• Fixed case where you could point at a Survivor but not register a tongue hit
• Fixed Smoker tongue not targeting and landing properly through PZ ghosts
• Smoker tongue does damage every second while dragging paralyzed Survivors

Tank

• Bashable objects now appear with a red glow
• Tanks hitting a car with an alarm disables the alarm permanently
• Tank frustration timer is only reset by hitting Survivors with rocks or fists
• Reduced autoshotgun damage against Tanks

Witch

• Witch spawns at the same % through the map for both teams
• Avoids spawning within a certain % of the tank
• Fixed an exploit where the Witch could be woken up and tricked into attacking Survivors