We have pretty old iOS application that implemented using Unity and Vuforia. After update Vuforia to version 4.2 we get bug that can be easily reproduced.
Bug reproduced on iOS8 and iOS9.
Application works norrmally (user see camera view and unity UI controls) until device locked and unloked (some times enough one time, sime times we have to lock/unlock it several times). In result of this operation we get black screen under unity UI controls.
We have checked "UnityAppController" where we tried to apply camera accessibility fix from this thread https://developer.vuforia.com/forum/ios/ios-8-xcode-6-and-vuforia-30-compatibility but nothing.
Have anybody ideas how it can be fixed or may be there is already known bug in Vuforia?
Thanks in advance.