title: Failure to stop executing task in Xcode 4.3
body: <p>I just installed Xcode 4.3 and I'm having some issues with stopping my app while running in the iOS simulator. I'm able to quit the simulator, but I cannot stop the task from running, either by hitting the stop button, or using the keybinding. In order to stop the process, I literally have to quit Xcode and restart. This obviously makes any development at all very difficult. I found this bugreport: <a href="http://openradar.appspot.com/10970285">link</a>, which sounds very similar to the issue I'm seeing.</p>
  
  <p>Is this a known issue with 4.3, or has anyone else experienced this behavior? I haven't used Xcode for over a year now (v3), so I can't say if it was working with any other previous versions of Xcode 4.</p>