We have logged a bug for this issue. We will update you, once the engineering team will prioritize the bug and fix it.
2½ years and Adobe has done nothing about this issue. Adobe calls it customer "support".Anonymous supported this idea ·
1 voteAnonymous commented
I don't think I'm doing anything special when this happens other than perhaps working on a PDF that appears on my 2nd (non-main) monitor. Usually, I'll be in Editing or Commenting mode involving a large PDF (created by combining other PDFs) and I'll be searching for a word/phrase. Then, sometimes, a large rectangular block of the PDF will be blacked-out, usually after I scroll down. I'll then have to hit Ctrl-0 or Ctrl-1 to restore the document, but that's a temporary fix.