I've had a problem of my laptop background reverting to a previous picture. No forums have provided a solution. I've found a work round that stops the frustration of this problem. I'm not a techy, so this may seem a little crude!! I copy the picture (photo) I want for my wallpaper, and put both the original and copy into a folder. I then go to the personalise background, select slideshow and select the folder I have just filled with my two copies of the picture I want for the background. So far, the picture I want hasn't changed!! Not a perfect solution, but at least I have the wallpaper I want..............