A required update for Team Fortress 2 is now available. Please run hldsupdatetool to receive the update. The specific changes include:

- Fixed a bug that prevented Mac players from getting the Halloween achievements.
- Fixed a bug that prevented Mac players from receiving the in-game notifications for items, duels, etc.
- Fixed Engineers being able to build under the final capture point in Mann Manor.
- Added the Dealer's Visor for players who pre-purchase Poker Night from Telltale Games.
- See http://www.teamfortress.com/post.php?id=4608&p=1 for full details.