Thumbnails are hourglass but photo shows if enlarged
I have over 55,000 photos in PSE 2018 Organizer without issue but lately all the photos I add are only showing hourglass image for their thumbnails. The full size images are fine and I can use all PSE functions. The "update thumbnail" under the edit pull-down does not help. I am using Windows 10. Any suggestions on how to fix the problem would be greatly appreciated.
