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Which version of Sigil?
Which platform?
If Windows please make sure any links match case of all characters in filename as some readers are case-sensitive.
Is your epub an epub2 or epub3?
The toc you are referring to, is it the html toc, the epub3 nav, or the epub2 toc.ncx?
Which links are broken?
Does the chrome epub reader support epub3 or only epub2?
Could you be making an epub3 but kept never filled in the ncx from the nav?
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