I imported a CD with the iTunes app and successfuly generated AAC files of the tracks. However, some of the files do not play back while others play back fine. What happens is, when I select those problem files, other files from the same album get played instead. I don’t know if this is important or not, but these files are quite large, being from a classical album and lasting up to 20 minutes. Also, I just updated it with the latest firmware.