Silly me. I've just checked the Book Details screen, and found that both the ebooks I can't read are in mobi format. That has never happened before; I'm so used to uploading from calibre and getting the ePub that I never thought to check what format was coming. And as you suggested I do have the original ePub and a calibre conversion to mobi in calibre.
I've deleted both mobi files and will try again. I suppose that since I've turned off uploading anything but ePub when I try again I'll get the ePub, and it will be readable. Is there anyway of telling calibre that I only want the ePub version? As I wrote earlier I've never had a mobi version come on to the tablet before.
PS Fixed. Now only the ePub comes on to the tablet, and I can read both ebooks I couldn't read before. Thank you.
Last edited by AlexBell; 08-24-2016 at 08:58 PM.
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