I've managed to figure out that it's in fact not the Unity panel, but the menu bar for Nautilus that's hiding under the Gnome panel. (This became obvious in instances where either the Gnome shell or the Unity shell failed to load, and I was left with just an empty desktop and the menu bar.)
I've managed to figure out that it's in fact not the Unity panel, but the menu bar for Nautilus that's hiding under the Gnome panel. (This became obvious in instances where either the Gnome shell or the Unity shell failed to load, and I was left with just an empty desktop and the menu bar.)