those steps were exact what I did. I firstly imported one book and kindle was fine to find it. somehow, when it tried to open the book, it was blank. nothing was presented. I tried to turn the page and nothing worked.
secondly, i had to deleted all imported books from kindle import and tried import it again. it did not work. then i converted a few books later and sent them all back to TP. the calibre library showed all books located in device with green checkmarks.
do I need to unregister kindle and delete it and reinstall?
by the ways, the books are still in TP .palmkindle folder.
Kindle Import doesn't delete the books from .palmkindle but unregistering Kindle should. Sure, try deregistering and removing Kindle and the .palmkindle directory (if it isn't) and reinstalling/registering.