[ / ] Key turned photos black

I was in library and pressed the / key, and a few photos immediately went totally black. Help. It is a Mac

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Legend

Some first steps:

- Restart your computer and then LR. Do the Library thumbnails still look black?

- If you edit one of the black thumbnails in Develop, does the image look correct, or is it all black?

- Do the menu command Help > System Info and copy/paste the first ten lines here.

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