A quick update: The book I was reading at the time I described was a book I downloaded from Amazon, in .mobi, and converted to .epub in Calibre.
I finally decided that the problem was due to the same kind of problem that Windows, for example, has when it hasn't been refreshed for awhile - peculiar things can begin to creep in. So, I decided to bite the bullet, I created an additional column in Calibre so I knew exactly which books were there, and did an automatic factory refresh. I then used that new column to select the books to send back, with Calibre, and all seems to be working properly again. So, now I've made the same note to myself that if Kobo starts to 'misbehave' - do a factory refresh and start over.
Thanks to all for the information - the details about how the books are organized inside were fascinating!! Thanks for that!
Sparky
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