title: OS X Visual Effect View in Interface Builder not display correctly
body: <p>I am trying to edit a Visual Effect View in an OS X project in Interface Builder, but all the Visual Effect View and its contents disappear/reappear randomly. When I change Core Animation layers, sometimes they seem to appear correct again, but when I move anything, it disappears again.</p>
  
  <p>I am on Xcode 6.4 and OS X 10.10, with deployment target latest OS X, but this problem was apparent before too. What am I doing wrong?</p>