I purchased Steve Martin’s “the Crow” (banjo music) from Amazon MP3 store. I noticed that the artist, album, and songs were all appearing as  (rectangular box) on the Fuze.
After several attempts to rewrite the tags, I used mp3tag. I don’t know exactly what I did that made the change, but I changed the setting in Tag Options > MPEG from “ID3v2.3 UTF-16” to “ID3v2.4 UTF-8” and then “Save Tags” on all the files. Now they appear correctly on the Fuze.
Odd, but I’m happy to have found a workaround.
Has anyone else had troubles with Amazon song downloads?