title: Xcode 6 - Main.storyboard only showing up as source code, Interface Builder missing
body: <p>Somehow my Xcode settings got messed up as it would only show my Main.storyboard file as XML code. I've been told this can be fixed by selecting the Interface Builder from the "Open As" menu, but there is nothing under the menu (the only "selection" is a greyed-out "&lt;None&gt;"). I've cleared my Xcode caches, but this does not help. Other than that, my project still compiles properly.</p>
  
  <p>How can this be resolved?</p>