I recently imported all my previous .psb files into Lightroom. Most of them came in fine, but 5 of them have black thumbnails in grid view, and black images in loupe view as well. If I open the images in Ps from Lr, they appear and behave normally. Saving in Ps doesn't fix the image problem back in Lr. I have tried rebuilding the preview, but nothing changed.
Any ideas?
Ralph