Wallpaper settings keep resetting? I added a folder with some wallpapers to the Desktop settings and also applied Change Picture every 30 mins. However, the folder randomly disappears and the wallpaper switches back to the Galaxy one for unknown reasons. I tried multiple settings and even without adding the folder (using the default folder but with rotation), but still get the same weird result after some time. I am not sure why this happens, but was wondering if there is a way to fix it ?

Any ideas ? I tried one of the answers but I still have the same problem ..

UPDATE

Okay I managed to find something new today !! I was working with multiple desktops and noticed that Desktop 2 still changes the backgrounds at set intervals! Is there a glitch with my first desktop or something ?

UPDATE 2

Apparently desktop 3 did not change wallpapers ... unless I change the settings. So why did desktop 2 decide to change its wallpapers without me changing its settings ? Could this be creating a conflict ?
Just open you Library folder by holding down the option key (alt) and select Library from the Go menu in Finder.
Navigate to the Preferences folder and delete com.apple.systempreferences.plist

Empty your trash then restart.  Then try adding the folder and changing your wallpaper again.  There's a stuck setting.

*Apple Certified Mac Technician