Photo thumbnail is blank after edits
I am very frustrated with Photos for Mac. A couple of updates ago, I began to have an issue come up. When I edit a photo on Photos and I am finished editing and click done to go back to the thumbnail page, the edited photo is blank. If I click on the blank thumbnail and hit edit and reset adjustments, the thumbnail is back, unedited now. So basically, I am unable to edit any of my photos. Otherwise, it works to allow me to upload my files, drag selected photos to the desktop, etc. But it is worthless to me if I can't edit them. I prefer to use Photos for the very basic edits I do, so I don't want to use PS or another program. For awhile, this only occurred if I used the auto enhance and I could get around it by doing all the adjustments one by one, but today after importing a large number of photos, it did not allow me to do even this. Has anyone experienced this and found a solution?
iMac 27″, macOS 10.15