Its not a bug as such but the changes to the resource manager etc have changed the way this happens, yes it does happen with the default skin as well.
The way to overcome it add client commands to the event in the event manager. So where there is mimimise add an extra event for client minimise and for exit add client exit, xlobby will know if you are on a client or the main program and apply the vorrect event.
I only did this myself this week.