Hi John,
Yes, I gave them a try. Here are the results:
Update Photoshop
I can't afford to update Photoshop because I am retired and living on a rather small, fixed income. I thing that version 7 should work because it worked on my Vista computer for over 10 years without problems.
Grant Photoshop "Full Disk Access"
That's for a MAC computer, I have PC computers.
Hide all layers in the Layers panel then Save again
I hid all layers in the Layers panel but still could not save the file.
Roll back to the previous version of Photoshop
All I have is version 7 and 7.0.1.
Further testing shows that the same problem does occur on my Vista computer, so I'm not sure that the installation is faulty. I think there is something funny going on with the JPG files themselves. It is odd that on both computers, I can save the files a few times. Then the problem pops up and then I can no longer save anything that Photoshop opens, be it JPG, PNG, TIF, or even PSD.