Source:
http://steampowered.com/v/index.php?area=posts&id=1613
Updates to Team Fortress 2 have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:
Team Fortress 2
- Changed video options initialization to fix some HUD resolution problems in mods
- Fixed crash issuing the last disguise command when not connected to a server
- Fixed rare crash on exit
- Fixed a couple of issues with gamestats reporting incorrect values
- Fixed an exploit that allowed clients to crash servers
We can only hope the best and ban the rest