My sorting preference of notifications center apps does not save.
So in order to arrange the notification center app groups in the order of my preference, I went to settings>notification and tapped "sort manually". Then I tapped edit and arranged the apps in the order I like. I click done. Leave the app, and open notifications center and my preference is not saved. When I go back to the notifications center settings, it seems none of my changes were saved! The order of the apps is just what it was before I moved them around.
iPhone 4, iOS 5