Scrollview scrollsToTop doesn't work when containing multiple side by side tableviews? Have searched repeatedly

I looked in this thread and tried everything I saw, and I can't seem to get it working.

Scroll to top of UITableView by tapping status bar

I have a UINavigationController and a UITabBarController. The application first opens to a UICollectionView.

When the user makes a selection, it brings up a ScrollView run by a custom UIViewController ("ScrollViewController"). The ScrollViewController makes four TableViewControllers and puts their TableViews in the ScrollView side by side with paging enabled, and has a floating UIPageControl as well.

Tapping the top bar scrolls the CollectionView to the top, but once I bring up the ScrollView, I can't scroll up from anywhere. I have tried setting all the TableViews' scrollsToTop to NO, no change.

Any suggestions?