Anyone else having this trouble? I go into System Preferences>Desktop & Screensaver. I have a folder in my Pictures directory called Wallpapers, with lots of sub-folders depending on the genre (one for TV/Film, Video Games, Landscapes etc.) and so I click the plus sign to add the folders for me to choose my background from. I choose my background and close the Desktop Preferences. So now I want to change my Desktop background again. I open it back up, and all the folders have disappeared again (save for the folder in which my current Desktop background resides). Anyone else having this problem, and/or know a way to solve it? Running a brand new Mid 2012 MBP 13" and Lion.