Xcode 8 hangs on startup; [MT] DVTAssertions Warning
<p>I needed to work on my app in a different orientation, so I opened my main storyboard and selected the appropriate size class. Xcode froze up, and from that moment forward, I haven't been able to do anything in my project at all. Xcode hangs whenever it opens because it tries to open the storyboard. I checked the console to see what was happening and this message is repeated: </p>

<blockquote>
  <p>[MT] DVTAssertions: Warning in
  /Library/Caches/com.apple.xbs/Sources/DVTFrameworks/DVTFrameworks-11224.1/DVTKit/LayoutViews/DVTLayoutView_ML.m:401
  Details:  An instance of IBUIViewControllerEditorView observed 5
  non-integral frame changes in a row for an instance of IBUIView with
  superview IBUIViewControllerEditorView. Further automatic layout
  invalidation has been canceled. Object:<br>
   Method:<br>
  -_invalidateLayoutIfNeededAfterRegisteringRectChange:forView:table: Thread:   {number = 1, name = main}</p>
  
  <p>Please file a bug at <a href="http://bugreport.apple.com" rel="nofollow">http://bugreport.apple.com</a> with this warning message and any useful information you can provide.</p>
</blockquote>

<p>Has anyone encountered this?</p>