I'm just using the ones that you can add under Theme Setting , Get more themes online . The background would randomly change often driving me nuts . So I search around for an answer and found what I listed . Yes, if you use just picture like you say it wouldn't change but once you load 3rd party ones you need to place it on Slideshow . I don't get MS at times . There was nothing wrong in how it was settled up before . Its like the old saying, if it ain't broken, don't touch it Also you can right click the desktop and select personalize