When I use a digital projector (any projector), mirroring off, so dual screens, each screen's desktop cycling through photo files, different file/same file makes no difference, the secondary screen gets confused and intermingles two foto files. Sounds trivial, but I do presentations for a living and have a certain batch of photos that I need the desktop to display before I start. If I ever get it fixed (and I never really know how I get it fixed), it defaults back when I restart. Second question - how do I reset the defaults?