Pioneer DDJ-RB controller not working with Rekordbox on Mac

Hi,
My DDJ-RB controller won't work with my Rekordbox/Mac Setup.
I'm running Mac OS X El Capitan 10.11.6, I've updated all the drivers, firmware etc. I've followed the advice in all the forums, but still no luck getting it to work.
The Mac recognises it in Audio Midi Setup, but none of the controls work when I go into Rekordbox.
Can someone help please?
Thanks,
J