Why instead of a TOC does FM return blank pages??

Of course, without the additional information this could be a non-useful comment :-} but what I've done often enough to remember is cleared all the entries I didn't want (in the left-hand side of the set-up dialogue) and somehow not replaced them with the entries I do want. I can't remember how I've managed this, but I have.

To check whether you've managed the same trick, right-click on the ToC entry in the .book and then select Set up table of contents from the context menu. If there are no paragraphs/elements in the lefthand list, FM is diligently doing what you asked it to do instead of what you thought you'd asked it to do.

re: Why instead of a TOC does FM return blank pages?

Anyone who might be able to comment usefully is going to need a lot more detail about how you created the TOC, whether it ever worked, and what changes you've made to it and/or the body files.

Top suspects:

• You somehow didn't create the TOC as a "generated" file.
• You managed to break it as generated.
• The paragraph tags being sought for inclusion are not present (under their existing names).