I rebooted both Sky and UnitiQute , no success - took out the optical cable and re-inserted it no success .
Then I switched the BluRay player on - that is served through another input (obviously) and sound emerged !!!
Switched back to the input that had been previously blocked and sound came out.
Ian, I can’t respond to you. But I wonder why you need still the Uniqute as you have already the Nova.
Can’t you connect your Nova to your BlueRay and Sky box , with digital out?
I believe the locked state means its connected not as in locked out. When I switch to my TV input without the TV switched on, it states not connected. When I power on the TV it states digital signal locked & the audio commences…