Sure thing, Norman.
As a matter of fact, now that I have successfully retrieved several files of various types repeatedly, I remain convinced that these particular error messages in the BackUp Tab are phantom messages. Something is of course triggering them, but they have no substance. Just yesterday I again went to my Retrieve Tab and successfully performed another test retrieve of various Word and Excel files.
So again, unless WD comes up with something definitive, I will rest on my theory and just keep happily using the product. (Other than this quirk, it is a fantastic hard drive!----I love it!).
If anything different develops, I will post back to this forum.