This is actually a very simple answer.
Open the storyboard file on Xcode 5, and then:
- Open File Inspector
- In the Layout section of the interface designer, change Open from to Xcode 4.6 (if it is 5.x).
- Save, close the project and open it with the old Xcode.
Now it should work.
This is the same method as in earlier versions, so I assume that is normal for the NDA case (you can do the same on Xcode 4.6 to work with the old version).
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