This was one of my less brilliant moves, I suspect — on the Mac server I had two “recently played” smart lists, neither of which was updating and hadn’t for awhile.
So…I removed those, and some other playlists I didn’t need. I expected Plex would generate a replacement.
Plex…did not.
I’m stumped at how to recreate that specific smart playlist (I did generate one for a single library, but I’d like it to pick up from all the music libraries.)
Similar smart lists on the Windows box are secure.