Desktop Wallpaper folders disappearing/reappearing in System Prefs
I recently upgraded to a 15 Inch MBP with Retina Display and I have a problem with desktop wallpapers. I migrated everything across from my old mac and when I go into System Prefs > Desktop & Screen Saver there is a list of all the folders I've added with all my wallpapers in. I've deleted these out because the wallpapers are no longer suitable for the new display. I've then added in a couple of new folders with retina wallpapers in and everything is fine. The problem occurs when I quit System Prefs and go back into it, all my old folders have reappeared and all my new folders have disappeared. Due to this problem sometimes when I boot up my MBP the wallpaper has changed to something random.
I'm getting a bit fed up with removing and adding the folders back in now, is there any reason why it might be doing this or is there a solution?
MacBook Pro with Retina display, Mac OS X (10.7.4), 2.6GHz, 8GB Ram, 512GB, 1GB NVIDIA