Hi guys, Hope somone can help with this, it's been bugging me ever since I upgraded to Mountain Lion! Whenever I change the desktop wallpaper with any of the ones provided on my Mac and reboot my laptop it reverts back to the original wallpaper that was set back during Lion (OS X 10.7) before the upgrade. I'm currently running the latest update (10.8.1) on my MacBook Pro Retina and still having the same problem! Any help would be appreciated! Thanks.