I have some folders with photos for a web site that I run that were created about 9-10 years ago. When you look at the folder's contents and see icons that are Medium Sized, several of the images in the icons are multi-colored images that look as if they are corrupted however when you change to view Extra Large Icons or sometimes just Large Icons, they appear correct as if there is no problem. The images preview normal and open without a problem. What could possibly be causing this? I've included a photo of what I'm talking about, the icons that appear corrupt are Medium but when switched to Large or Extra Large, they look normal. Any thoughts?