title: Post of NSNotificationCenter causing "EXC_BAD_ACCESS" exception
body: <p>A <code>UIViewController</code> adds itself to the default center:</p>
  
  <pre><code>[[NSNotificationCenter defaultCenter]
   addObserver:self
   selector:@selector(editFood)
   name:@"editFood"
   object:nil];
  </code></pre>
  
  <p>Then a <code>UITableView</code> delegate NSObject posts a <code>NSNotification</code>:</p>
  
  <pre><code>[[NSNotificationCenter defaultCenter]
   postNotificationName:@"editFood"
   object:self];
  </code></pre>
  
  <p>During run time it get a <strong>EXC_BAD_ACCESS</strong> exception.</p>
  
  <p>Is the <code>defaultCenter</code> getting released somewhere? The same concept works when I post a notification to a UIViewController from a UIViewController, but that shouldn't matter, right?</p>