Happens on ipad and composer in windows.
Navigation animations present the new scene low in frame - its like the whole presentation has dropped down 400 to 500 pixels
It only happens to scenes with videos as backgrounds.
Oddly it will navigate correctly first time scene navigated to. But re opening a scene via navigation displays it low in frame.
If I turn animation OFF during the navigation then the scenes always load.
So it seems navigation WITH animation AND videos doenst work on its second appearance.