Offizieller Kommentar
Per the support site:
Our first tests show that different issues occur when running the following products under OS X El Capitan.
We therefore cannot recommend our customers to update to OS X El Capitan.
Applicable products:
DJM-S9, DJM-2000NXS, DJM-2000, DJM-900NXS, DJM-900SRT, DJM-850, DJM-750, DJM-T1, DJM-5000, DDJ-RZ, DDJ-SZ, XDJ-AERO, XDJ-RX, MEP-7000, RMX-500