Board Thread:Support Requests - Getting Technical/@comment-27178869-20140409204602/@comment-2093602-20140409204945

There need to be at least 4 headers on a page before the toc is added. You can also force it by using  anywhere on the page.

Edit: Looking at your Wiki, it seems the problem is CSS related instead. This line in your MediaWiki:Wikia.css is hiding the toc: .WikiaMainContent .show {display:none;}