I think it would be a good idea in the future development to add in a feature that will save your History so you can save it now and undo things you don't want later. Just an idea.
Every other time I try to open a single photo, PDN will crash. When I open 2 or more it doesn't, but if I open just one, it crashes. I attatched the crash log so someone and help and try to figure out why it's doing this.
pdncrash.rar