Source: Steam
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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- Fixed certain crashes with paged pool memory
- Added a warning for when paged pool memory is low
- Fixed some prediction errors with player avoidance
- Fixed columns and row bunching up in server browser
- Fixed a rare bug where the wrong launcher.dll was being used to launch the game
- Fixed teleporter/spawn doorway exploit