I downloaded all my images onto lightroom the same way I always do, but then they started to go black. I don't mean they went dark as in exposure, I mean the image is just a black square. Has anyone had this happen before? I just finished a wedding shoot, it's late, and the "customer service" center is closed.
This is a known issue and Our Engineering team is working on it.
Please follow this link https://helpx.adobe.com/lightroom/kb/thumbnails-display-black-in-lightroom-6-2.html
Here is a Duplicate thread:-Lightroom images turning black
Let us know if that helps