title: My app freezes only in iOS 4.3.5
body: <p>My iPhone app consists of a tabBarController and data is being shown by making a synchronous request to the server.</p>
  
  <p>So, whenever I navigate from one tab to the other or from background to foreground, in most of the cases the app freezes giving me this error message three times in the log.</p>
  
  <blockquote>
    <p>+[CATransaction synchronize] called within transaction</p>
  </blockquote>
  
  <p>I face the same issue referred in this <a href="https://stackoverflow.com/questions/7196197/catransaction-synchronize-called-within-transaction">link</a> but with iOS 4.3.5(iPod) only.</p>
  
  <p>I tried to research a lot but no luck.
  Please help me in fixing this issue.</p>
  
  <p>Thanks.</p>