I was using Ps yesterday and all of a sudden I can`t see the image when I place it on my canvas. I tried openning several in different ways, they show on the layers but I can`t see them anywhere. The canvas is black now although I never changed it from White. And it`s not just with images, what ever I do on the canvas, strokes with the brush or create figures. I JUST CAN`T SEE THEM in the canvas. Help!