This app is great and all but I'm trying to edit something and the screen is black. When I think it has worked I press the save button but it just kicks me of the app. I've tried to undownload it, restart my device, and discard the video and try again but no, its doesn't want to work for me and stays with a black screen!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!