Are you using the RC still?
No. Home edition.
But I think I found the reason for this problem : When I click on a pic I might want to use as a wallpaper, I double clic on it
and my favorite program ( Photofiltre ) opens up and shows the picture. Then I set it as the wallpaper. Windows 7 doesn't
If I right click on the pic and set it as the wallpaper from there, it remains. That is what I do now on.
Thanks for helping out !