EDIT: IT HAS DONE THIS TWICE. Usually a great app however I have noticed a new bug. I saved my work and then backed out so I could read part of the instruction manual and when I go back into my art work file, all of my folders have been undone, all renamed layers have reverted to randomized numbered names, all layers are on, all layers need to be reorganized as they have ordered themselves by number. My brush and eraser have reset to default too. The app has also been crashing like crazy.