After one of the updates (it was a bit of time ago, so no idea which one), my L4D stopped showing any available games. This means either I have to do quick play (which doesn't allow you to specify which map) or make up my own lobby. I just want to be able to join a game already in progress.

All it says is, "No available games were found". No matter what options I change (campaign or versus, various maps, lobby or game), it says no games are found.