Rotated photos disappear
Mac
Mojave 10.14.1
Photos 4.0
When I go to view my photos (Photos selected under "Library," I can see them all. However, if I "open" a photo by double clicking it, and then rotate the photo, it disappears and goes to a different photo. If I then double click on the photo that replaced it, so that I can see all photos again, I can see the photo that I rotated. However, if I double click on it to open it, it opens for a split second, and then goes to the earlier photo that replaced it. This happens on all photos that I rotated today.
I tried repairing the library (by holding down option-command while launching Photos, but it doesn't seem to help.
One other fact--I have FatCatSoftware's PowerPhotos 1.5.8 installed on this iMac.
Thanks for any help.
Joe
iMac, macOS 10.14