I have unknown before problem with IB.
I’m creating navigation bar in my IB, but if y of it equals 20 it looks good at the iOS 4, but on the iOS 5 – not.
Screenshots.

IB

iOS 5

iOS 4.3.3
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Seems, that the view in iOS 5 does not have a Status Bar enabled. Enable a Status Bar in the view and the problem will be solved!