I'm also having problems with 10.14.6.
Before trying the links above I had looked for various fixes and downloaded Totalmix FX and the latest drivers, and even dragged the old Totalmix off my last computer (as I couldn't find anywhere to download it). To no avail.
Once I tried the above links the Babyface was noticed momentarily, but then disconnects, and connects, and disconnects until eventually crashing my computer. I'm not sure whether I've got so many drivers and apps that maybe that's confusing things, but also don't want to delete anything as it was all a bit hard to track down to begin with.
Should I delete every RME driver and app before the one you've posted a link to above? Or do I still need them to get full functionality? Or can you think of any other reason that could be causing this problem?
Thanks