title: Debugger stopping at a non existent breakpoint in Xcode 4
body: <p>Since upgrading to Xcode 4 my app stops at what I think are non existent break points. When it breaks there is no breakpoint showing in the breakpoint navigator and the editor says:</p>
  <blockquote>
  <p>Thread:1 Stopped at breakpoint 17</p>
  </blockquote>
  <p>Anyone else seeing this? Is this something new, maybe?</p>