I had that happen to me a couple of times while trying to enlarge a PDF knitting pattern...no pics, only text, though I'm not sure of the file size just at the moment. A restart of the Kindle solved the problem entirely. Hasn't happened again with that or any other document. Just to note, prior to that, I'd been working extensively with my Kindle and multiple PDF's, adding to library, personal docs and more and it had been quite a long time (maybe a month) since I'd actually done a restart.
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