An update has been released for Left 4 Dead 2.

- Prevent a crash if a material overflows the index buffer.
- Zombie population fixes for Left 4 Dead 1 Mutation modes.
- Fixed some material properties on Left 4 Dead 1 common infected models.

An update has been released for Left 4 Dead 2.

- Fixed a crash after failing to load a map.
- Fixed a crash caused by missing materials.

An update has been released for Left 4 Dead 2.

- Fixed a crash in particle systems loaded from Add-ons.

An update has been released for Left 4 Dead 2.

- Fixed security issues reported by Justin Taft from One Up Security, LLC.

An update has been released for Left 4 Dead 2.

- Fixed a potential remote code execution exploit.

An update has been released for Left 4 Dead 2.

- Fixed a server lagging exploit.
- Fixed some reported security exploits.
- Fixed key bindings not displaying correctly when using the Xbox 360 controller.

New EMS scripting features:
- Added a new interface for reading/writing entity network and data table fields from script. Use "script_help NetProp" for interface details.
- New script function "TakeDamage( amount, type, attacker )".
- New script function "GetNetworkIDString()".
- Added "timeofday" keyfield to the world entity.
- Support auto_spawn of witch bride.

An update has been released for Left 4 Dead 2.

- Fixed an issue on some MacBook Pro models that prevented the game from rendering correctly, resulting in a blank or white screen with game running in the background. This fix required a change to the minimum spec from MacOS 10.6.4 to MacOS 10.7 (Lion) or higher, which matches Steam's minimum spec.

An update has been released for Left 4 Dead 2.

- Fixed multiple potential remote code execution exploits.
- Speculative fix for Mac startup rendering issue.
- Updated Steam API version.

An update has been released for Left 4 Dead 2.

- Fixed two exploits that could allow remote code execution on clients and servers.
- Disabled some debug tracking that was causing a crash.

An update has been released for Left 4 Dead 2.

- Fixed an exploit where a player could call a vote that would pass immediately without input from the rest of the players.
- Fixed an issue where sounds could start looping on Linux.
- Fixed Steam Controller issues with spectating and MOTD.
- Fixed a bug that could cause some servers to hang on shutdown, causing a temporary reduction in total server capacity after updates.
- Fixed a remote code execution exploit.
- Upgrade OSX SDK version.