I think the title of the thread explains a lot. I think it occured either at 4.0 or 4.0.1, hard to say. The pictures themselves work fine, I can click on any one of them and display them full screen, but their thumbnails are covered in black on the camera roll screen, so I have no idea what picture I am tapping on. Photos taken after the "blackness" show up perfectly fine, same as the ones before it. Any known fixes?