Hi,
Well I have the same problem. Updated the KC from firmware 5.0 to the latest one. I did the update via Bome and a Midisport
midi interface on a low speed.
With startup the lcd screen shows Access Virus C and previous it showed KC.
All sounds and knobs working accept for the keys and also the local on/off option removed from the settings menu. I have used Mystery Island software while the keys were working and the local on/off option in the settings menu visible. So I don't believe Mystery Island has something to do with it because this happend after the firmware update.
It looks like the KC is not recognised as a KC but as the desktop C version.
Did anyone find a solution to this. I have tried many things.
Greetz Vin