If it is a corrupted image file that is causing the problem I wouldn't hold my breathe waiting for Sierra to fix it. The solution will almost certainly involve identifying the corrupted file and either repairing or deleting it. Logically the corrupted file would be one that is used in the photo book which would limit the number of possibilities.

You might try a minor edit on each of the images to see if that "fixes" the image or opening and saving each image in an external editor such as Photoshop Elements, Graphic Converter 10, or Affinity Photo.


If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein