アプリケーションのPagerAdapterがPagerAdapter#notifyDatを呼び出さずにアダプタの内容を変更しました。

When initializing the ViewPager, the contents of the adapter should be initialized before passing the adapter to the ViewPager.
If not, you should call the adapter's notifyDataSetChanged method after updating the contents of the adapter.
Otherwise, the application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged exception.
The specific reason can be found at: http://stackoverflow.com/questions/16756131/fragmentstatepageradapter-stopped-working-after-updating-to-adt-22