Already unplugged Masterlink.
They are connected to the BS3 with a BV4. This is the main room. A BS9000 is also connected as Option 0. In the bedroom I have a BV7...
The other speakers BL3/10 are working, not the BL5. They are not listed in the loudspeakers menu. Calibration works
UPDATE:
Yes it was an Option problem. Thank you!! Didn't know that there's such an option for loudspeakers...