Can you please upgrade to 1.4.5 and see if it's still a problem? Thanks
http://kubuntu.org/announcements/amarok-1.4.5.php
** Changed in: amarok (Ubuntu)
Assignee: (unassigned) => Andrew Ash
Status: Unconfirmed => Needs Info
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amarok weird behaviour when changing system time
https://launchpad.net/bugs/82328