[KevinH]

Ah ... he did not create the Table of Contents (nav under epub3) first so the TOC tool had nothing to work with. He did the Create HTML Table of Contents first with out ever generating the nav in the first place.

Please try running the menu item Tools->Table of Contents -> Generate Table of Contents first.

That will provide you with a menu for you to select which headers it found and what you want to include into your Table of Contents..

That info used for the nav is them used to generate an HTML Table of Contents when it is asked for using the Tools->Table of Contents->Create HTML Table of Contents.

An HTML TOC is optional, but the nav is required to have a valid epub3.