From the Updater main window, choose Settings -> Updater -> Reset all Settings. You'll get a confirmation dialog. Once you confirm your choice, everything will be reset and you'll be prompted to restart the Updater.
You will need to re-select any file variants since they will all be at default after the reset.
Strictly speaking, this resets the Updater rather than the UI itself. However this is what I did to banish the ghosts and it worked.
-= Therendil =-
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