Hi @elan ,
So it is HiFiBerry causing the issue? This is new. It used to work really well. Actually, I purchased the HiFiBerry DAC (for connecting the headphones), and the HiFiBerry Digi for connecting to my amp via Toslink based on this post Plexamp Gapless playback over Chromecast Audio? - #2 by elan
The USB dac does not sound like a solution for my amplifier connection. I’ll keep tinkering with the system until it works again - or, I will have to get something else installed (I really hope not, Plexamp in itself is amazing, and I want to keep using it).