title: Can't type text into UITextField or UITextView in iOS6
body: <p>In one of my apps, when I try to edit (type some text) <code>UITextField</code>, <code>UITextView</code> or any other 'text-able' <code>UIControl</code> the cursor just blinks but <strong>no characters are typed in</strong> except BACKSPACE (possible only when I have some initial text in it), RETURN and switching character types. This goes to all controls across whole application.</p>
  
  <p>Summary:</p>
  
  <ol>
  <li>It happens only from iOS 6.0 (does not occur on iOS 5.x, 4.x neither Simulator or real device)</li>
  <li>All delegate methods are fired (shouldBeginEditing: didBeginEditing:) <strong>except</strong> shouldChangeCharactersInRange:</li>
  <li>isFirstResponder flag is behaving set correctly (shouldBeginEditing: logs NO, while didBeginEditing: logs YES correctly). It is also tested using logs that THE firstResponder IS the one already edited.</li>
  <li><strong>It repairs itself after</strong> any <code>UIAlertView</code> is presented to the user and dismissed. It doesn't matter if this alert is shown on the same screen (UIViewController view) or any other. </li>
  </ol>
  
  <p>I have no idea how to even approach or debug this.</p>
  
  <p>Where should I look for hints? Any experts of tracking responder chain related issues etc.?</p>
  
  <p>How can I track down the <code>UIAlertView</code>'s effect on the issue?</p>