I have something similar, but it does not seem to be associated with specific pages. It seems to be somehow refresh related as flipping to the next page and flipping back will cause it to go away. It seems to occur randomly, except that it infallibly occurs when I access a footnote preview box and then close it. The area below where the box was will appear pale and spindly and will go away with a page flip and return to the original page. It did not occur, as far as I can remember, before firmware 3.12.
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