We use Skitch for Ipad 4 at school. I had completed several documents that had been saved and was finishing up the last one. All of the sudden the app froze and my only option was to click the home screen button. When I reopened Skitch, all of my documents were gone. Documents that had been saved. I can't believe I have to do all that work all over again. How can saved documents just disappear?? Please help!