title: Xcode 6 GM crashes when selecting the main storyboard or a xib
body: <p>I just downloaded the Xcode 6 GM and every time I select the main storyboard (and a specific xib) Xcode crashes.</p>
  
  <p>The error to be sent to Apple contains the following info</p>
  
  <blockquote>
    <p>ASSERTION FAILURE in
    /SourceCache/IDEInterfaceBuilderCocoaTouch/IDEInterfaceBuilderCocoaTouch-6238/InterfaceBuilder/Documents/IBCocoaTouchPlatform.m:531
    Details:  Returned status computation result is not an
    IBMarshallingResult, it's {</p>
  </blockquote>
  
  <p>Anyone experiencing the same problem?</p>