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Create an iPhone projet in Xamarin Studio.
Add a new UIViewController.
Change the namespace of the UIViewController (if it is Blackglade.iOS for example, make it Blackglade.iOS.Screens).
Double-click the .xib of the view controller to open it in Xcode.
In Xcode, click the 'Show Assistant editor' button.
Assistant will complain it is unable to load.
Xamarin Studio 4.0.3 (build 13)
Did you remember the rename the namespace in the *.designer.cs file?
Mike just recently fixed namespace renaming so this should no longer be an issue