I just built a new PC and totally found myself flummoxed over the issues with Kindle for PC and Calibre. I <3 my Calibre!!!
Rolling back to 1.17 of the Kindle (and making sure updates down auto-install) saved my birthday wishlist!
A thousand thank yous to all of you who post clear, detailed information, so I can get back to reading (and writing) instead of digging around the web for answers.
Very relieved,
Anne.