Good afternoon TheOldTomcat,
What model and year of your Mac is showing when you click > About This Mac?
What operating system and what version of iTunes is currently running?
We recommend updating your software if you haven't already done so, as this may help address the issue you are having.
Make sure you have a current Time Machine backup before making these changes:
Back up your Mac with Time Machine
Update macOS on Mac
Note that the newer versions of iTunes changes the way music, movies, TV shows, podcasts and audiobooks are managed on a Mac.
Take care.