First, many thanks for the help.
I tried Sadievan's suggestion:
Quote:
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In Calibre go to Preferences\Behaviors and make sure AZW and AZW3 has a check mark by it and then click 'apply'.
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I only found a list of file types for Calibre's internal viewer, and though that didn't seem quite right, I dutifully checked the boxes for azw and azw3. And then loaded some of the Kindle files that wouldn't convert last night in their original form. And they converted, no problem.
Then I removed the books, went back and unchecked the azw and azw3 boxes, and loaded the Kindle files again. And now they STILL converted, no problem. Made sure the boxes were still unchecked, and they are. So I don't know what the heck was going on yesterday and why everything works fine today.
I did notice that yesterday all the files with the azw extension were showing in Calibre as azw. Today they were showing as azw3, mobi, and htmlz.
I have also been interested to see that others had the problem of Kindle for PC not loading anymore--that happened to me yesterday too. I had to install a newer version to download my Amazon books. Then after the problems with Calibre not converting the files, I reinstalled the old version again, thinking I'd have to convert the pre-Calibre-plug-in way.
It looks like this tools package has a non-Calibre option that doesn't require the old version of Kindle for PC, so I'm assuming I can safely update the Kindle for PC software? It's pretty annoying that it just stopped working with no warning--I wasted a heck of a lot of time trying to figure out what might be wrong with my computer!
The upshot of all of this is that I'm going to be even more unlikely to purchase an e-book from Amazon, regardless of price--it's way too much hassle.
Now I have to deal with my backlog of BN books--more fun!
Thanks again!