I recently updated to  Windows 8.1. from XP and now use Photo Gallery but have to say I, like many others, wish we could go back to the simplicity of XP.

I edited a number of photographs in Photo Gallery and duly saved the alterations.  However when I now go into the folder the format of some of the edited photos has changed - they appear to have been "thinified" -  and the only way I can see the photo as it should be is by hovering  on the "black & white" box in the Edit format and photo goes back to 'normal'.   However, having then closed down the folder the 'corrupted' format then re-appears when next opened.  It does not happen with all photos.  What have I done and how can I cure this?