Thank you so much! At first I thought that actually solved my problem, because I had a ZBMINIL2 in my system as well. After removing it and rebooting Deconz, my switches worked again! Unfortunately, after an hour or so, they revert back to their non-registering status. But rebooting the system again gets them back to work. Still only Philips Hue switches are affected. So we’re getting closer, but not quite there. Anyone have an idea where to go from here?