OK. After a listening session I removed my RoonServer Cache file with no change. Renamed and moved my RoonServer Database folder and let Roon build a new database which appeared to bring back my profile picture and local artwork. Of course, that resulted in the loss of a lot of bookmark and editing work, so I reinstalled the faulty database file.
Should I attempt to restore from a backup? I have 10 Roon backups available to choose from.