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November 21, 2007 - Valve

Updates to Team Fortress 2 and the Source Engine have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include: Source Engine

• Took a more aggressive approach to solving the exploit that would allow players to get underneath terrain in Team Fortress 2
• Fixed a regression with walking on terrain in Half-Life 2: Episode Two

SourceTV

• Fixed building bone merge cache from dormant entities. Fixes weapons in SourceTV attached to wrong bones
• Pass over spectator UI and scoreboard in SourceTV mode, disabled/changed some VGUI elements
• ALT will switch to Auto-Director mode in SourceTV