If you put = Factbox = in with Version 1.17 it does create the Factbox tab and shows the Factbox under the Factbox tab. What is broken is the Factbox showing at the bottom of the page when any other tab is used or the main tab on landing at the page. Kind of defeats the purpose of the Factbox tab if it showing under all the tabs. Then again, I'm not sure if the Factbox is just showing under the Factbox tab because it is under every tab. I have no content under under the tab = Factbox = so that may be the case.
Is there a fix yet, or planned fix for 1.7? Building a new semantic wiki and I would have stayed with 1.16 if I knew this was still a bug. I wonder if you can control it with CSS?