I have purchased two MP3 tracks from Amazon (both recently) and have encountered no problems using them with mt-daapd 0.2.4 on a Linux host.

On examination with "id3v2 -l", both tracks have ID3v1 and ID3v2 tags which look normal, non-pathological and in no way sinister.

My first suspicion is that you've got a bad build of mt-daapd. Or, perhaps one of the libraries on which it depends is b0rked. (I'm using libid3tag 0.15.1b, FWIW.)

I have a Mr. Occam on the line, and he asks me to convey his suggestion that application bugginess may be a simpler and more likely explanation than proprietariness or crazy-assitude.