So this has happened twice on my Macbook Pro. I have saved a file as a .psd and when I reopened it to work again there are chunks of the image missing. The first time it was two placed objects and one rectangle I drew. The center of these images were missing and showing transparency through it. The thumbnail in finder showed the same thing. I just chalked it up as a fluke, re-did the work and saved again. Now it looks fine. However, today I opened another file and it did the same thing. Image is attached. I've shut PS down and reopened it. Nothing has changed.