@eschwartz - thanks for the pointer to "Update metadata embedded in the book when opening".
That explains why I get a prompt from Editor to Save the file ... sometimes. If I had updated the book comments or something, and them went to edit it it'd prompt me to save even though I didn't think I made any changes. I always wondered about that.
That options stops all metadata being updated which I don't think I'd prefer, so I think my curiousity has been satisfied, and I won't agonize over it any more
|