Quote:
Originally Posted by DNSB
That sounds as if the original ebook did not have a table of contents or properly marked chapter headers. Have you tried enabling Force use of auto-generated Table of Contents in the Table of Contents section under Conversion/Common Options?
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I did some experiments and it looks like it's because I have it set for epub 3 in the output options. For no particular reason, except for consistency I suppose, since I always use epub3 when starting something in sigil.
It's unfortunate that calibre doesn't also produce the toc.ncx file when the output is set to epub 3. In sigil I always generate one just before the final epubcheck.