I've got a dataset overlaid onto a 3D-rendered structural using the Render (new) plugin. I was fiddling with the color bar (I right clicked to change the color scheme) and somehow got my mouse cursor stuck within the color bar. The small popup window that says "Button-1=flip; Button-3=menu" is displayed, but none of the mouse buttons are currently doing anything. I can move the cursor up and down within the color bar, but that's it. I've done this a thousand times before and this has never happened. Is there a way out of this other than rebooting? Is it a bug or is there a key stroke that will undo this?