It appears that this exception is normal iOS behavior. Asking to change to an unsupported orientation is not allowed by the OS. In the provided sample it looks like the issue lies in ModalViewControllerLauncher.m (supportedInterfaceOrientations). Since it is not in the engine code there isn't anything that we can do to resolve the issue.

I can think of two solutions.

1. Check that the parent view controller supports the orientation that you need to rotate to before doing so. Something like this:

- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
if (self.requirePortrait)
{
if ((self.parentViewController.supportedInterfaceOrientations & UIInterfaceOrientationMaskPortrait) ||
(self.parentViewController.supportedInterfaceOrientations & UIInterfaceOrientationMaskPortraitUpsideDown))
return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationPortraitUpsideDown;
else
return UIInterfaceOrientationMaskAll;
}
else
{
return UIInterfaceOrientationMaskLandscape; // this covers both landscapes
}
}

2. Subclass UIImagePickerController and override supportedInterfaceOrientations. See here for more information on this technique. https://stackoverflow.com/questions/19374237/using-uiimagepickercontroller-in-landscape-orientation

It sounds like that may not always work but is worth trying out.