Yamaha Steinberg usb driver not working on MacOS


MacOS 10.12.2

My Steinberg driver - v.9.1.10 was working fine - now I just have garbled rubbish coming from it - unable to hear anything on Netflix in any browser. Plays music but not any singing.

Using a Yamaha THR10C - no help on Yamaha sites.

I have uninstalled, reinstalled. Tried rolling back to an earlier driver - none works.

Does anyone have any suggestions please?