I've had this a couple times on different characters.
A
really easy fix is to simply remazzify (type /mazzify) with nothing but "Look and Feel" on the first setup screen.
This way you don't have to go through the processes of updating all of your addons again or worrying about losing your keybinds. Doing this will simply update the addons which control the art, and unit frames (such as DuF, which is the cause of the problem) to where they should be.