Plexamp for Raspberry Pi no longer connecting to server

Perhaps related…

I did reinstall Plexamp 1.1 on my Windows desktop just to try to generate an up-to-date server.json file for my Pi, and for whatever reason Plexamp 1.1 is giving me the

NO MUSIC SERVERS

error*. It had worked previously, because that’s how I was able to generate the initial json file.

So for some reason, older Plexamp’s can no longer connect to my PMS.

EDIT: I’ve now installed Plexamp 1.1 on both an additional Windows laptop, and a separate Mac machine, and all give the “NO MUSIC SERVERS” error. I’m thinking the problem is more in the PMS than Plexamp or the Pi.

*error is exactly as described here: