Every time I either shut down my computer or unplug it from an HDMI source the background goes back to the preloaded default background. I have tried a million different ways of getting it to save, does anyone else have this problem? But more importantly, HOW DO I FIX IT?!?!
MacBook Pro (Retina, Mid 2012), OS X Mountain Lion (10.8.5)
If you log in automatically, a known bug will cause the desktop picture to revert to the default image of a galaxy at every startup. The only workaround is to disable automatic login in the Users & Groups preference pane.