Updates to Counter-Strike: Source 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

• Fixed prediction errors on the client when navigating


• Fixed bug where server sent updates slower than specified in cl_updaterate


• Fixed prediction errors when cl_updaterate is a large number
  People who turned off cl_smooth should re-enable it after this release.


• Fixed a rare crash in physics


• Option -heapsize now works correctly on machines with more than 4GB of memory

Counter-Strike: Source

• Fixed exploit with demo recording clearing flashbang and smoke effects


• Fixed minor exploit allowing thirdperson even if cheats were disabled on the server


• Fixed bug allowing movement at run speeds while ducked