Updates to the Source Engine have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:
Pure Servers
* Servers can now force the client to match the server´s files, by becoming a pure server. When a server enables sv_pure, clients who connect and play on the server cannot gain an advantage by modifying the game content. For more information about Pure Servers, click here.
Source Engine
* In-game server browser only shows human players in the player counts column. Bots column now shows number of bots instead of a "some bots" or "no bots" icon
* Fixed servers with bots reporting incorrect number of bots when sv_master_legacy_mode is set to 0
* Fixed a server performance problem with queued packets
* Increased the maximum rate to 1 megabyte
* Added a findflags console command, which can list all cvars with a specified flag. For example: ´findflags server_can_execute´ will find all console variables and commands marked with FCVAR_SERVER_CAN_EXECUTE
* Cheat protected many cvars and commands
* Removed cl_restrict_server_commands to prevent clients from being redirected
* Fixed user names reported as "unconnected" when greater than 32k players had connected to the server
* Fixed a client crash during authentication
* Fixed a crash when mashing the ~ key on disconnect
* Fixed a bug with sv_minrate and sv_maxrate not applying properly on the client
* Fixed the free roaming camera in SourceTV demos
* Fixed cl_language archiving itself and not updating correctly when the language changed
* Fixed a voice recording bug that could cause voice dropouts
* Fixed a rare crash when spectating in Counter-Strike: Source