title: Some random crash EXC_BAD_ACCESS
body: <p>I'm getting EXC_BAD_ACCESS but I don't know anymore what to do.<br>
  I get the error when I try to switch tabs (UITabBar). Nothing executes according to NSLog. </p>
  
  <p>The tabbar tab event is a segue where no code of me gets executed...<br>
  (arc enabled)</p>
  
  <p>edit:<br>
  When I enable zombies, I get <code>*** -[TDAppDelegate respondsToSelector:]: message sent to deallocated instance 0x6e8a260</code></p>
  
  <p>I can press the rightBarButtonItem, the modal view is presented and just works (it also communicates with the appdelegate). When the modal view is dismissed, and I try to switch tabs, the app crashes again. [UITabBarDelegate tabBar:didSelectItem:] gets called.</p>
  
  <p>stack:</p>
  
  <pre><code>(gdb) info malloc-history 0x6e8a260
  Alloc: Block address: 0x06e8a260 length: 44
  Stack - pthread: 0xac4932c0 number of frames: 32
      0: 0x9428c90b in malloc_zone_calloc
      1: 0x9428d837 in calloc
      2: 0x1bc1c93 in class_createInstance
      3: 0x1bcc88b in _objc_rootAllocWithZone
      4: 0x17de661 in +[NSObject allocWithZone:]
      5: 0x1bcc8b9 in _objc_rootAlloc
      6: 0x66f2d6 in -[UIClassSwapper initWithCoder:]
      7: 0x76dfa2 in UINibDecoderDecodeObjectForValue
      8: 0x76d6b7 in -[UINibDecoder decodeObjectForKey:]
      9: 0x66eead in -[UIRuntimeConnection initWithCoder:]
     10: 0x76dfa2 in UINibDecoderDecodeObjectForValue
     11: 0x76d9af in UINibDecoderDecodeObjectForValue
     12: 0x76d6b7 in -[UINibDecoder decodeObjectForKey:]
     13: 0x66e305 in -[UINib instantiateWithOwner:options:]
     14: 0x87484f in -[UIStoryboard instantiateViewControllerWithIdentifier:]
     15: 0x87499e in -[UIStoryboard instantiateInitialViewController]
     16: 0x4501e3 in -[UIApplication _loadMainStoryboardFileNamed:bundle:]
     17: 0x450461 in -[UIApplication _loadMainInterfaceFile]
     18: 0x44f7c0 in -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:]
     19: 0x45e743 in -[UIApplication handleEvent:withNewEvent:]
     20: 0x45f1f8 in -[UIApplication sendEvent:]
     21: 0x452aa9 in _UIApplicationHandleEvent
     22: 0x1feafa9 in PurpleEventCallback
     23: 0x17b01c5 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__
     24: 0x1715022 in __CFRunLoopDoSource1
     25: 0x171390a in __CFRunLoopRun
     26: 0x1712db4 in CFRunLoopRunSpecific
     27: 0x1712ccb in CFRunLoopRunInMode
     28: 0x44f2a7 in -[UIApplication _run]
     29: 0x450a9b in UIApplicationMain
     30: 0x2a18 in main at /Users/user/Desktop/app/main.m:16
     31: 0x2975 in start
  </code></pre>