Updates to Left 4 Dead Demo have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:
Left 4 Dead Demo
Fixed several issues with matchmaking and password protected servers
Tuned matchmaking to provide better search results
Fixed bug where servers could stay reserved by matchmaking forever
Performance optimizations and fixes to networking layer
Fixed issue where game could cause Steam executable to use too much CPU
Fixed music resetting when changing video settingsFixed some issues with not being able to chat and/or connect to other users