Korg Forums

Thanks svatikk! NanoKontrol v1 stopped working after upgrade to OS X El Capitan. Removed KorgUSB driver from /Library/Audio/MIDI Drivers/ and advKorgUSBMIDIDriver.plugin from /System/Library/Extensions/ and rebooted. Now it works and I can still use Korg Kontrol Editor. Bizarre! Follow these ...

I have just tried what svatikk said but nothing has changed . . . Impossible to recognize to nanokontrol by the korg control editor and also impossible to send midi data from the nanokontrol to Ableton Live.

Yeah, I have the same issue as you, I have installed os x el capitan and my korg nanokontrol is not working anymore with ableton live. I think it s a midi compatibility issue and we must wait for a new driver from korg for the nanokontrol.
I hope that will be quick . . .