Comment 5 for bug 86920

I've been able to resolve this issue on my system. The problem for me was a gconf one. In /system/gstreamer/0.10/audio/profiles, I had an entry for mp3. However, in /s/g/10/a/global, there is a "profile_list" key, and it did not have mp3 listed. Simply adding mp3 to this list was sufficient to get track transfers onto my iPod to work again.