If you use auto layout between the UIWindow and your root view (to set the root view to fill the entire UIWindow) these constraints will get blown away by a full screen presentation of another view controller.
What happens, is the entire hierarchy of the full-screen presentation replaces everything below UIWindow - your original view is removed (blowing away the constraints) and the new view hierarchy substituted. Then when your review is replaced, these constraints are lost. You would need to recreate them somewhere like viewWillAppear: or just ensure your root view has self.view.translatesAutoresizingMaskIntoConstraints = NO;
