kovidgoyal
I have done all that you said(above) and for a very short while it worked,then stopped working,..........................again.
I finally deleted Calibre from my PC, factory restored my Fire HD10,re installed Calibre onto my PC & it worked,for a short while,then stopped working again.
Must admit,it is really getting beyond a joke now.
The 2 files that you mention "driveinfo.calibre and metadata.calibre" should they be on a device at all as you mention deleting them.
Its fast getting to the stage where I am considering using a different program that may not be as good but at least they will work.
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