Spurious "computer not authorized" errors
Since upgrading to iTunes 12.2.0.145, I've been getting occasional "Your computer is not authorized to play..." messages on some songs, with a prompt to authorize the machine. Providing a valid iTunes password does not make the song playable. In some cases, these are songs that were purchased over a year ago. One problem song was listed as an "AAC audio file" when it should have been a "Purchased AAC Audio File".
I have tried to deauthorize and reauthorize the machine. I also deauthorized the machine, quit iTunes, removed the "/Users/Shared/SC Info" folder, restarted iTunes and reauthorized the machine. Neither made a difference.
So far, the only solution I have come up with is, in iTunes, to delete the song (and move the file to the trash when prompted), and re-download the song from the iTunes store. Has anyone come up with a better solution?
Mac mini, OS X Yosemite (10.10.4), iTunes 12.2.0.145