I notice it creates a tmp file while saving, then it goes away. It does have a dwl file open while I'm drawing, but not after closing. It's weird, it saves changes sometimes, then dumps all the pics without notice? I have restarted my computer, and the changes will be saved, then I will open the file later down the road, and all pics are lost. It's a head scratcher, definitely annoying! Wonder if windows 10 has something to do with it? But, it was doing it before I upgraded also.