[Doitsu]

Originally Posted by saoir

This is the TOC section that Scrivener puts at the front of the ePub file. [...]

Assuming that the book actually contains the files body1.xhtml, body2.xhtml etc. the HTML TOC should work, but you'll also need an NCX TOC, which Sigil can automatically generate if each chapter heading is enclosed by a heading tag. For example:

<h1>Chapter 1</h1>

or

<h3>Chapter 1</h3>

If you used heading tags, simply press CTRL+T in Sigil to generate an NCX TOC; if you didn't use heading tags, change whatever tags the heading is enclosed by to <h1>...</h1> and press CTRL+T.