How can I move a MS Word "toolbox" when the grab area is behind the OS X menu bar?
I've had success with problems like this by changing the display resolution to a lower value. This will often force floating palettes to reposition themselves. If the palette moves, reposition it to an accessible spot and switch back to the original screen resolution; you can now position the palette where you wish.

This also works for modal dialogs or pop-up windows where the controls are positioned off-screen, though it may require jumping to a higher resolution (if available) to have access to the window or menu controls.