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Helpful answers
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Oct 4, 2016 11:57 AM in response to JButtsby irina_w,Hello JButts!
Welcome to the Apple Support Communities and thanks for bringing your question about Preview displaying PDFs with a strange checkerboard overlay. Preview is so useful, but less so when it's obscured with another image. I'm happy to help you out today.
First I'd like you to start up your Mac in safe mode and test to see if Preview does the same thing.Try safe mode if your Mac doesn‘t finish starting up
If it occurs in the test user as well, you'll want to try reinstalling macOS. Reinstalling macOS will not affect your data or settings, but puts a fresh copy of the operating system on your Mac and can resolve issues like a built-in app that's not functioning properly.
If it still occurs in safe mode, then try creating a new user and testing a PDF in Preview there.
How to test an issue in another user account on your Mac
Have a great day! -

