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iAd Producer: Simulator does not open with Xcode 4.2.1 or earlier
The iAd Producer simulator does not open if you've installed Xcode 4.2.1 or earlier.
To resolve this issue:
Locate the Xcode application. Xcode is typically installed in /Applications/Developer/Applications.
Open and quit Xcode.
Return to iAd Producer and open the simulator.
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