[Jeffers24]

The artist bio used to show when I played local MP3s or a radio station, now it doesn't.

Would you suggest what I need to check/change?

Not sure.  I just checked in my Estuary mod, and when using the Radio addon or playing songs locally, the artist bio shows (as long as I have that setting enabled in the skin mod).  What is displayed and how is a skin decision, so if you changed or updated your skin recently, that could have something to do with it.  You could enable debug logging in both Kodi and Artist Slideshow, play a song, and then go through the log.  AS logs *lots* of info in debug, so you should see the artist get identified, then some skin properties set (among them the artist bio if AS found one), and then images downloaded (if any new).  If you're still stumped, post a link to the full debug log and I'll take a look. 

Thanks for pointer to skin.

I use Aeon Nox SiLVO and found a setting in the Music tab of customisation called 'Enable artist information feed' which I set to persistent and all works again. How it got unset I don't know.