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
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Source: Steam