Okay, after an Update to the latest OS and a reboot the B-MM appeard. Dunno what happend but its looking good now.
My Workaround for the controller (VMC) was that i kicked them out - and they automatically reboot - and in the meantime i add them with the + command to the group that i want. When they come up they take place in the new group.
I get a little bit confused about those problems... but i hope 8.2 and 8.3 would fix some issues :-) and i hope my mm is now running correctly to add my controllers :)