I have all my music on the external sd card. Is that the reason the playlists that I create in Music Player dissappear? The titles of the lists stay, but the songs go away. Also, when I set music tracks as personalized ringtones for various contacts, they too disappear and I get just one ringtone for all calls. That ringtone is in media/audio/ringtones, which is on the internal card. I'm not sure when the disappearing act happens...maybe after each reboot.