I recently noticed that, when using the iTunes music-sharing feature, I am not able to see a certain album (Sgt. Pepper's Lonely Hearts Club Band, to be exact) on the remote Mac. The album is indeed present, accountable, and playable on the host Mac, however, on the remote one it is nowhere to be seen. Playlists containing a song from this album simply show up without the songs in question. My first idea was that the files were not MP3, but indeed they are. What could possibly cause this?