Just want to share .. I encountered the same problem, where Calibre could no longer do deDRM for AZW3 from my Kindle Paperwhite .. It turned out, the issue was due to Kindle PC installed on my laptop .. I removed Kindle PC and now Calibre and its plugins can handle AZW3 just fine ..
There is no need to uninstall Calibre and its plugins, just uninstall Kindle PC, do restart of your PC/laptop and it works just well ..
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