Comparing two toc.ncx files:
A - the one inside the epub file generated by Calibre from my rtf file (which does not work in FBReader on my Android phone)
B - the one inside the Project Gutenberg book which I downloaded (which works in FBReader)
I have noticed that whereas the <navPoint> tags in B have playOrder properties numbered consecutively 1, 2 , 3, ...., those in A have playOrder all set to 0.
Could that be significant?
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