Refresh problem in File Explorer

In an earlier thread, I reported that following an update file explorer no longer automatically refreshes after a deletion or change. I tried all the suggestions, but the problem persists.
So I swapped a recently made clone of the hard drive and booted that. The same problem is happening on the clone, which was made before the problem started. The clone was problem free.when tested.a few weeks ago.
Can anyone explain how this can happen.