Updates to Left 4 Dead 2 have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:
Left 4 Dead 2
Fixed missing subtitles
Re-enabled the "wait" command, fixes a hang at startup
Fixed several crashes that were reported to our crash database
Fixed some addon content eclipsing game content even when not playing an addon campaign. This resolves several issues with missing or incorrect models, textures, and effects. This fix temporarily affects the ability to host custom campaigns on dedicated servers. We are working to restore that functionality as soon as possible.