Comment 7 for bug 340515

Yes, if you manually start vino-server then enable it in Remote Desktop Preferences afterwards, this sets the AutostartCondition to true and causes gnome-session to start another instance. This instance immediately exits though because there is already one running, which triggers this endless cycle of restarts you're seeing.

If the first instance of vino-server is registering with gnome-session, then I think that's a gnome-session bug (I can't check that until I get home later though).