I can't reproduce it reliably, but this is how it occurred the first time:
Up-to-date lucid in virtualbox. Changed resolution and aspect ratio.
My workspace switcher was messed up, each workspace was double-width, presumably because of the aspect ratio change.
I right click on the workspace switcher, my bottom panel crashes (top panel is fine) and apport pops up with this bug.
Hope this helps.
I can't reproduce it reliably, but this is how it occurred the first time:
Up-to-date lucid in virtualbox. Changed resolution and aspect ratio.
My workspace switcher was messed up, each workspace was double-width, presumably because of the aspect ratio change.
I right click on the workspace switcher, my bottom panel crashes (top panel is fine) and apport pops up with this bug.
Hope this helps.