I don't know if this helps in your case, but make sure all your views and controls support autorotate. The UINavigationController does not, neither does the UITabBarController. The Tab Bar controller will stop supporting it if any of it's child views do not support autorotate.
I had to create my own UINavigationController and make it inherit from UINavigationController and then implement the autorotate. Since you are doing your application completely in landscape I don't know if this helps or not, but it might get you started down a path to your solution.
I came across a similar problem with a MapView. Basically you have to make sure all your subviews implement.
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