iOS 9 Orientation Auto-Rotation Animation Not Working, But Always on Main Thread

Question

iOS 9.0 (13A340) Xcode 7.0 (7A220) OS X 10.10.5 (14F27)

I have a situation where if I rotate the simulator or device (using iPhone 6s sim and iPhone 6+ device), the

Answer 1

I'm instantiating my own view controller stack of a navigation controller in app delegate. I fixed the problem by removing the Main interface from the project file.