I have many images on my computer, and this only afflicts a few of them, but of course they are the ones that I want the most!!
What happens is that when I go into an images folder and make it so that I am viewing the "Filmstrip" mode, I can see the entirety of all of my pictures in the small thumbnails. However, some of the pictures, when selected (and thus enlarged and brought to center), suddenly have an area of grey or some other solid neutral color. It is as though I had colored over half of the picture with a grey paintbrush, but I can still see the whole image in the filmstrip.
Also, if I edit one of these pictures, and save both versions, I can see the entire original in the filmstrip, but I can't even see the entire edited version.
I have attached an example of what I mean.
P.S. The reason I am mentioning the filmstrip is that I figure if I can still see the whole picture somewhere, it may not be entirely corrupted. I may be very wrong, but that is why I keep mentioning it.