this is a taint from the minimenubar error that has been reported in another thread.
**** This file fix is in the patch that Scott released on the 13th *****
go to this msg to get a file that will 'fix' it for now
micromenubar error fix
you will need to download it and copy it to your wow directory.. \interface\addons\nUI\Bars
though it still errors with pet battles, and repositions itself, you'll need to do a
/nui rl to then fix it again after a pet battle
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Have fun, and remember WOW is just a game, for us to enjoy, and all the Addons we use.... remember the programmer is a human too, and MOST times, is doing this as a hobby, so give them time to have their life, so they can fix the addons, so we can have our WOW life.