Sven Co-op 4.7 was released last week. Anyone who updated their client can no longer connect to your servers.
I also released Deagles' Map Manager v3.25Beta a couple of days ago. This version should eliminate getting stuck on broken maps in Sven Co-op. I don't currently have a Sven Co-op server of my own, so I'd like to know if you experience any problems with this version of Deagles' Map Manager.