I have 2 folios in my folio producer, both of which have a green tab in indesign cs5.5, but for some reason they wont show up in Content Viewer on my iPad. All of my software is up to date.
My first response is something akin to, "is it plugged in," and I hope you don't take offense. I have had problems with folio's not updating, and it's because I wasn't signed in to Content Viewer, or because my iPad didn't - at the time -have a network.
One possibility is that the folio has an invalid article, such as a single-orientation article in a dual-orientation folio. Can you preview the folio (not the article) in the Folio Builder panel?