title: My app freezes but no error appears
body: <p>Does any body know what I have to check if my app freezes? I mean, I can see the app in the iPad screen but no buttons respond. I have tried debugging the code when I click on the button, but I haven't seen anything yet. I was reading about the Instruments tools; specifically how do I use them?</p>
  
  <p>Can anybody help me? I just need an explanation about how use the tools.</p>