title: iOS app crashing every other launch, can't find error
body: <p>First time I launch the app, everything seems to run fine. I'll hit the stop button, do some work and when I go to launch it again, it seems to crash before it can even load anything. 
  Press stop, hit Run again, and it works fine. Until I repeat the process. </p>
  
  <p>This is where xcode is highlighting the error with "Thread 1:signal SIGABRT". 
  Obviously nothing useful here. </p>
  
  <pre><code>int main(int argc, char *argv[])
  {
      @autoreleasepool {
          return UIApplicationMain(argc, argv, nil, NSStringFromClass([PokerAppDelegate class]));
      }
  }
  </code></pre>
  
  <p>The debug console shows nothing besides (lldb) (So I suppose its stopping, not crashing at this point)
  So, when I perform a <code>BT</code> this is what I get:</p>
  
  <pre><code>(lldb) bt
  * thread #1: tid = 0x1c03, 0x9a258a6a libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGABRT
      frame #0: 0x9a258a6a libsystem_kernel.dylib`__pthread_kill + 10
      frame #1: 0x99ea1b2f libsystem_c.dylib`pthread_kill + 101
      frame #2: 0x04a7057b libsystem_sim_c.dylib`abort + 140
      frame #3: 0x01dc0b4e GraphicsServices`GSRegisterPurpleNamedPort + 348
      frame #4: 0x01dc069f GraphicsServices`_GSEventInitialize + 123
      frame #5: 0x01dc0c1f GraphicsServices`GSEventInitialize + 36
      frame #6: 0x000163f9 UIKit`UIApplicationMain + 600
      frame #7: 0x00001d0d Guitar Chord Poker HD`main(argc=1, argv=0xbffff32c) + 141 at main.m:16
      frame #8: 0x00001c35 Guitar Chord Poker HD`start + 53
  (lldb) 
  </code></pre>
  
  <p>Here's what I have done so far:</p>
  
  <ul>
  <li>Performed a 'Clean' </li>
  <li>I've reset the simulators and reset my computer</li>
  <li>I've commented out all the code in the view controller, still crashes</li>
  <li>I've commented out all the code in the app delegate, still crashes</li>
  <li>BUT....I've run    the app on a device outside of Xcode, and it seems
  to work perfectly    fine.</li>
  <li>(EDIT) I've deleted/reinstalled xcode, and all content(Simulators, Docs) from the various cache folders (This stops xcode from automatically reinstalling the old ones after a new download). Still can't find where command line tools is kept though. Still crashes. </li>
  </ul>
  
  <p>Despite all this, apps still crash every second/other launch. </p>
  
  <p>Thing is I had no issues until the most recent Xcode update. 
  Could it be an Xcode bug? </p>
  
  <p>(EDIT) I am also running the latest developer releases of OSX. Could that be interfering?</p>