SOLVED: JF Media Client on Win 10 changes versions, inaccessible if run as standard user

[ninefootnails]

Go to C:\Users\yourUser\appdata\local, delete both the "jellyfinmediaplayer" and "Jellyfin Media Player" folders.  In a browser, go to your jellyfin server and then Dashboard > Devices.  Delete all the tokens for Jellyfin Media Player.

Open Jellyfin Media Player and log back in.

That was the perfect remedy and I learned something today.  Thank you TheDreadPirate for your help!  Very much appreciated!