I got an email from the Delicious Monster folks. They accidentally left some beta expiration code in Delicious Library, disabling both licensed and unlicensed users. Download it again, and that issue is resolved. While they were at it, they also added the other Amazon DBs.
Yuriko reports a greater accuracy rate with the music collection now that they’ve gotten the hang of scanning, and with the added databases.
I read the help file on the website and it’s well, helpful. I learned you can add multiple DVDs to your library using the option key, which is helpful for a series set.