Major bug plugging in USB devices on the computer
Macbook Air M1 with MacOS Bir Sur. Tried also in Macbook Air i5 with Catalina and iMac i5 with Catalina.
Rekordbox 6.5.3 Free plan with DDJ-400 plugged in
Broadcasting software (OBS)
When you plug in a standard USB microphone for use with other software, DDJ-400 stops working and Rekordbox and even disconecting it doesn't fix: you must restart RB with anything unplugged to work again. And if you plug again a mic it will break again!
Please, this is crazy.