((im asking this question for a friend))
my friend owns a macbook (retina, 12 inch, early 2016) and recently updated to 10.12.2. every time she shuts it down for the night, it changes to the default sierra wallpaper. (sometimes it changes during the day) she already deleted com.apple.desktop.plist + she only has one "desktop" on her macbook. what's going on ?
What is the location of the image that she is changing to? For instance, if you download an Image and place it on the desktop then make it your background, if you delete the image, the background will change.
Is it possible the image she is changing to are in a location that occasionally disconnect? USB drive, a cloud drive that is temporarily loosing connection?
Apple | System Preferences | Desktop & Screen Saver
Make sure this isn't checked?
it isnt checked
macbook wallpaper keeps changing by itself?
