title: iPhone app not starting on simulator, no errors
body: <p>I'm having a problem where my (simple) iOS app builds fine, says running but on the simulator I just get a blank screen. In xCode, it still says "Running XXXX on iPhone 5.0 Simulator" but also give a "Thread 1: signal SIGABRT";</p>
  
  <p>There are no readable errors in the bottom window, just:</p>
  
  <blockquote>
    <p>argc = (int) 1<br>
    argc = (char **) 0xbffff578</p>
  </blockquote>
  
  <p>It has been absolutely fine until now. I had the problem after trying to swap out a few images and their @2x versions for ones that I'd slightly tweaked.</p>
  
  <p>I've done a clean and I have cleaned the build folder. I have also emptied the DerivedData folder and tried rebooting. I've tried to add breakpoints in my AppDelegate in the didFinishLaunchingWithOptions method, but it seems to never reach them.</p>
  
  <p>Pretty much run out of things I can think of to try.</p>
  
  <p>Debug Navigator:</p>
  
  <p><img src="https://i.stack.imgur.com/SUZVN.png" alt="enter image description here"></p>
  
  <p>Edit:</p>
  
  <p>When I comment out:</p>
  
  <blockquote>
    <p>@property (strong, nonatomic) UIWindow *window;</p>
  </blockquote>
  
  <p>from @interface AppDelegate</p>
  
  <p>and comment out</p>
  
  <blockquote>
    <p>@synthesize window = _window;</p>
  </blockquote>
  
  <p>from @implementation AppDelegate, it loads fine albeit with a blank screen because I guess the window is not loading.</p>