Well, geeze. That was easy! I guess I had never set a default format in Calibre. When I plug in my Nook, it always downloads in EPUB. Plug in the Kindle, and it downloads in AZW3. Didn't need to set a default for that (Calibre is smart!)
Sorry, I didn't think to look for a default setting since I had never needed one before. I feel stupid now. Thanks!
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