I just did a clean install on my macbook.
Macbook late 2013, 512GB, 2,6 Ghz i5 Dual Core, 8 GB RAM, Big Sur 11.6.2
RB 6.6.1, DDJ RR newest Firmware, Latenz 512 Samples
Everytime I switch a Ap window from RB the Master Output sounds disappears. The channel Volume and the decks keep playing.
When I choose the highest latenz possible there are just some sound issues when I change the app windows, but the sound keeps playing.
In generell running RB on my macbook pro feels like using an old Intel 486. The CPU used by RB is above 70% and the fan keeps running.
Quitting RB the macbook seems to be freed of a heavy weight.