so I was editing on my phone (as usual) then a notification popped up and I had to check it, then when I came back to LR, suddenly just pure dark grey just appeared. I closed the app, re opened it, LR starts up, but still that dark grey background still there, as if it seems not to be loading anything from the app, I have unfinished photos to edit, even presets installed. I'm using a iPhone 5c. Then I tried to my iPad 4th Generation, it almost had the same problem but at least when re opened the app, it worked fine. Please help me.