title: Some UITextfields don't respond in iOs6
body: <p>Since updating to iOS 6 I have this weirdest bug when trying to make an UITextField or UITextView firstResponder.</p>
  
  <p>...it doesn't work.</p>
  
  <p>I am not able to select the field or view and bring up the keyboard, nor is there a cursor or anything.
  The weirdest thing is that it is only not working for SOME fields, other ones in different viewcontrollers work without trouble.</p>
  
  <p>I have:</p>
  
  <pre><code>[self.window makeKeyAndVisible];
  self.window.rootViewController = self.viewController;
  </code></pre>
  
  <p>in my appDelegate.
  It worked and still works without problems with iOS 5.</p>
  
  <p>Any ideas on what it could be?</p>
  
  <p>Thanks!</p>