OK Installed the calibre 8.44 tools 5.0 then downloaded the pc version of the kindle app, synced it with my account and now all is well. I can convert all my books to .mobi (and view them in calibre, so it looks like DRM has been removed.
My guess is this latest version of calibre has managed (in some cases) to loose the reference to the kindle app (windows and Mac.) I will check tomorrow if I can fix the Mac OS X version by following the above procedure and reinstalling kindle.app
fingers crossed.
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