
Hello,
I had the same problem.
I found a solution that worked for me.
First I turn on my XDJ-XZ and when it is fully started, then I turn on my PC. When the PC is started, I launch Rekordbox and then I select the blue Rekordbox button on the XDJ-XZ and I press the load tracks buttons 1 and 2 to pair the decks of the XDJ with Rekordbox.
It works for me...
Regards,
Pascal.