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

Source Engine

• Fixed a client crash
  
• Fixed sv_allow_wait_commands restricting the server using wait
  
• Fixed a crash in "soundlist" command
  
• Reallowed fps_max value of 0, which means unrestricted fps
  
• Fixed a crash playing back demo files recorded with the previously-released engine
  
• Client forwards server commands it doesn't understand back to the server
  
• sv_pure 1 now allows custom spray decals by default