title: ios 5 prototype cells and VoiceOver issue
body: <p>I am having a problem when trying to load a prototype cell when Voiceover is on. The app crashes and I get the errors</p>
  
  <pre><code>Assertion failure in -[UITableView _createPreparedCellForGlobalRow:withIndexPath:]
  
  Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:'
  </code></pre>
  
  <p>This only happens when VoiceOver is on, otherwise the app runs fine. Any help?</p>