may be related....
I added 4 kindle books at once using drag and drop onto main calibre window. when I then tried to convert them I had DRM locked issues with 2 out of the 4.
removing , then adding, the same books , the same way, one at a time worked fine though.
I wonder if the plug in can't handle batch adds or if there's an issue when /if calibre launches multiple simultaneous jobs.
I add from amazon so rarely that is' not a problem for me to always add books singly. just thought I'd mention it . I do have latest versions of everything, so it's not that & i'ts not obvious which needs investigating - calibre itself, or just the plug-in.
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