I am having an odd issue with my LG Thrive in that my music apps will play all my MP3s just fine until I link it to my computer via USB. When I disconnect correctly, all my music apps can't find the music files until I physically tell it what folder it is in again. REally annoying. It isn't a problem with the sd card though. Works fine in all my other devices and the contents are not disappearing from the card itself.