I managed to advance (a bit) locating a problem with the rotation on the iPad Pro. I have removed the initial rotation to landscape view on starting up the app, resulting in the screen to be drawn correctly, however with the wrong screen dimensions applied (the reason I enforce the landscape rotation which works reliably on all other devices tested and all simulators available in XCode 7)
When rotating the screen the first time I am getting the distortion.
after a further rotation the screen remains black.
Any ideas what could cause this behaviour as i am not experiencing it on any other device?
Thanks