An update to Team Fortress 2 has been released. The update will be applied automatically when you restart Team Fortress 2. The major changes include:

• Unusual effects:
  • Attachment point and offset for particle effects on unusual hats can now be adjusted from the character loadout screen
  • Fixed a bug that would cause unusual effects to float in the air over dead players
  • Fixed a bug that would cause unusual effects to show incorrectly sometimes when spectating other players
• Network interpolation and update convars can no longer be changed when playing. To configure these convars, players must not be connected to a server or must join the spectators
• Fixed a server crash caused by out-of-range animation sequence numbers
• Crates listed on the Community Market are now separated by series
  • Existing listings will be migrated over the next couple days