I can't change the default wallpaper. When I right-click the desktop and open "Change Wallpaper" (actually I'm using it in spanish, so it says "Cambiar el fondo de escritorio") I can select other images, but I don't see any change in the actual desktop, even if I close that window or restart it... is just like it doesn't make any change.
I have also tried to right click in an image in my home folder and mark it as wallpaper, but it doesn't work either.
Sorry if this seems like a duplicate question, but the other questions that I visited didn't help me at all :/
Thanks in advance!