I have had this twice with 2.0final and h413. All my playlists under P and R got stuck in root after trying to alter ID3 tags and synching in jemplode - had to use emplode to fix it both times.
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock