I have tons of photos on my mac. Some of them have blurred images when in thumbnail view and the upper right hand corner of the thumbnail has a bent edge on it. If I open get info there is a little thumbnail in the upper left hand corner of the get info box. If I click on that image and press delete and close the get info box the thumbnail is now fixed. Why do I have to do this to some images? I have been looking around for some info on this but have come up empty. How do I fix all my thousands of images without opening each one with get info and deleting the icon? Does it have to do with exif data? How do I fix this? I am in desperation over this.