After drag & dropping by accident a .xpm file on the top bar, the right-hand side is now totally missing (see attached example of missing pieces) :(
How can I get this back, please?
Update: It seems I am using gnome (flashback) Metacity (and no I don't want to switch to Unity just in case somebody's asking :)
Update2: Running dconf reset -f /org/gnome/gnome-panel/ solved my problem!
