Recently did a clean install of yosemite on my rMBP and I have encountered an issue. Whatever wallpaper I set and reboot, the wallpaper changes back to the default one. I researched this issue and checked out other threads and still haven't found a fix. One member on here recommended deleting the files User/Library/Caches/com.apple.systempreferences and/orUser/Library/Caches/com.apple.desktop.plist. to no avail. Anyone have a solution to this yosemite non sense!?