Comment 8 for bug 736209

Hi there. First time posting on launchpad. And this bug has happened to me 2-3 times now (using 11.04). I second the earlier poster, who suspect it might an issue with Libreoffice since seems to only be happening to me when I'm using Libreoffice.

$ gconftool --get /desktop/unity-2d/launcher/hide_mode

Results in: No value set for `/desktop/unity-2d/launcher/hide_mode'

And, "$ gconftool-2 -R /desktop/unity-2d" did not give me any output.

Found a solution though, on the ubuntu forums: Simply take an icon and hover it above the panel as if wanting to add it to the panel. You don't need to drop it in the panel even, the panel will be functioning afterwards.

http://ubuntuforums.org/showthread.php?p=10774124

Hope this helps! :)