@Ruskie_it: Okay, I see the failed extractions for:
* Carr, Caleb/L'alienista - Caleb Carr.kfx
* Christie, Agatha/Il misterioso signor Quin - Agatha Christie.kfx
Were those generated by Calibre's KFX output plugin?
If you could PM me one or both of those (even encrypted, shouldn't matter), I should be able to better figure out what might have gone wrong
.
(Can't (easily) test the KFX output plugin myself, no Linux support in Amazon's new tool).