I had a similar I/O problem on v1.42 a month ago. The eight channels assigned to AR2412 inputs 1-8 all stopped outputting to our Main LR one morning. PAFL and meters all indicated there was nothing wrong. IIRC, they were feeding the monitor Aux’s ok, but just no FOH. All other inputs were operating ok to all Main/Aux sends
We had to reload an old show to recover it.
I didn’t trust the show file any longer, so I recreated our current setup from an old backup show.
I try to keep a duplicate show file of our current setup, so at least I can load that if anything goes wrong.
Have just upgraded to v1.50, so hopefully that bug is squashed.
Matt.