Quote:
Originally Posted by theducks
The NCX has been mutilated  , probably by someone doing a hand edit.
Play order, is the invisible 'chain' of sections you get when reading. The chain is sequential, no duplicate 'play order' values
You might try fixing/rebuilding it using the TOC (icon) tool
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That someone

was me, unfortunately

.
I had to "fix" everything by hand as Calibre did not recognise chapters in the book, though they were separated by section and page breaks. Obviously I made a mistake, or two, somewhere...
I imagine it might be when I tried to insert a line above the first chapter separation, as suggested by Calibre. This line includes the title and I then inserted the three existing chapters of the book into it.
Do you have any idea of how I may be able to do this?