The app I'm developing uses a UINavigationController to control a variety of UIViewControllers, some of which are displayed in portrait orientation, and some of which are displayed landscape. Once one of the landscape ones is displayed, if I navigate back through the pages to the root view, part of the keyboard is still displayed landscape:
...instead of how it should be (and originally is) displayed:
I've paused the debugger (attached to the iPod) when the root view is loaded after displaying the landscape view, and in lldb, run po [UIDevice currentDevice].orientation. It outputs 1, which is the value for UIDeviceOrientationPortrait. So although the device knows it's in portrait mode, part of the keyboard is landscape. I've never seen anything like this before, and am not sure what else to check.