Thanks. OneDrive seems to be the culprit. The workaround is to stop syncing your Desktop folder with OneDrive.
Important: Before proceeding, copy the files in those special folders to another folder or external drive. Please don’t copy them anywhere under Desktop/Documents/Pictures. This is because disabling OneDrive backup for a folder erases the local copies of the files. Copying them to a different location beforehand will ensure that you don’t need to download them again from the OneDrive cloud.
- Right-click the OneDrive icon in the Notification area and click Settings.
- Select the Backup tab, and click Manage Backup
- In the Manage folder backup dialog, click on the Stop backup link for "Desktop"
- Click Stop backup in the confirmation dialog that appears.
Your analysis is correct. Turning off the sync of Desktop resolved the problem. I did not need desktop sync to OneDrive, and I had forgotten it was on. I will note though that my OneDrive configuration has not changed for months so it is likely there is a very recent Windows software change that exposed this problem. It was not obvious to me that OneDrive configuration would have been a factor in this problem.
Thank you for your original script suggestion and then your analysis and solution for this problem!!!!