title: App crashes on IOS 6 - UIViewControllerHierarchyInconsistency
body: <p>My app was working just fine until I updated to Xcode 4.5 and I ran it on IOS 6.
  Now it crashes with the exception - 
  UIViewControllerHierarchyInconsistency - A view can only be associated with at most one view controller at a time.</p>
  
  <p>Does any one have an idea why and how can I solve it?</p>