Source only available for grouping

Hello,

Out of nowhere,my KEF speakers are no longer available as an output device (connected to my computer thru a NAD wireless DAC).

However, if I select my headpones as output, I can add my KEF to this zone and get output on both devices.

This happened out of nowhere…

Any pointers to what may be causing this?

Restarting the core fixes this, last update was probably buggy.

@support I see 5 cases of my situation! device is online in settings->audio and available for grouping, but unavail as single zone!