this is fixed in 0.99.8, which hopefully get's in feisty soon. After that it could be a candidate for a backport.
snippet from Changelog:
WORKAROUND: Disable sorting of playlist view as this crashed gtkpod.
** Changed in: gtkpod-aac (Ubuntu)
Status: Unconfirmed => In Progress
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core dump when applying sorting options to playlists
https://launchpad.net/bugs/78219
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