Thanks for your bug. Is your planned placed on the bottom of the screen?
Is that the same issue than bug #30146? What version of Ubuntu do you
use?
** Changed in: gnome-panel (Ubuntu)
Assignee: (unassigned) => Ubuntu Desktop Bugs
Status: Unconfirmed => Needs Info
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Menu scrolling is unpredictable
https://launchpad.net/bugs/46061