title: View's content disappear after dismissing
body: <pre><code>func presentPicker(sender: UIButton) {
      let vc = LASignPickerViewController(nibName: nil, bundle: nil)
      let navBar = LANavigationController(rootViewController: vc)
  
      presentViewController(navBar, animated: true, completion: nil)
  }
  
  func dismiss(sender: UIButton) {
      dismissViewControllerAnimated(true, completion: nil)
  }
  </code></pre>
  
  <p>Presenting works fine, dismissing too.
  But after dismissing on the main view all views are disappearing after 1 second.</p>
  
  <p>There remains only the background color.</p>
  
  <p><a href="http://i.stack.imgur.com/JRP4i.png" rel="nofollow">Main View Controller</a></p>
  
  <p><strong>UPDATE</strong>: </p>
  
  <p>In the debug view hierarchy all right!
  And working - slides and button touches.</p>
  
  <p>????</p>