After updating to Xcode 7 and then the iOS 9 beta 5 on my iPhone, none of my UITableViews are displaying data, except one. They are all downloading information from my Parse
I also had this problem in iOS 9.1.
If you're only developing for one device family per storyboard, try unchecking "Use Size Classes" in the file inspector of the storyboard. It solved it for me.