Desktop Wallpaper folders disappearing/reappearing in System Prefs

I repaired my disks and changed my password and it seemed to have fixed the problem.

Okay, I had a short password initially, only 1 letter, then I changed it to a much longer password, 14 characters, and it worked. But if I change it back to a 1 or 2 letter password I have the same problems again. It's weird, but it worked with longer passwords.

i have the exact same problem and i'm running ML latest version with all the updates installed.

I never had this problem when i was on Lion. Yesterday i did a complete system restore (for another bug) and now the folders i add keeps disappearing...

Any luck Apple will fix this soon?

Same bug on my home iMac after a fresh install of Mountain Lion, but not on my work iMac where i upgraded from Lion.

Similar situation here… I have an 11" MacBook Air that I upgraded from Lion to ML and it's not having the problem. Also have a new 2012 15" MBP (Non-Retina) that came with ML installed and it is having the problem. Tried a fresh install of ML on the MBP but the problem persists.

I have a problem with my brand new MacBook Retina, too. After upgrading it to OS X Lion, the desktop photo I choose (of Apple's offerings) disappears when I log out. When I next open my computer, the desktop choice is the one I had BEFORE the upgrade. Any advice on this?

I have the same problem on my MBP with Mountain Lion and I haven't been able to fix it. What's more strange thouigh, is that I also have a Mac Mini with Mountain Lion and I don't have this problem there, I added all my desktop folders and they don't disappear whan I log out. I tried reinstalling Mountain Lion (clean install) on my MBP but this didn't solve my problem either, now I'm worried this is a different problem just with the MBP…

Having the same issue. Macbook Pro - Mid 2010. Did not have this issue until updating to Mountain Lion. Will try the suggestions and report back.

Yes, this is an annoying issue although I have discovered something else that's more annoying: I have a MacMini with ML too, and I had a program installed in it that changed the wallpaper automatically so I have never worked directly from the System Preferences for it, but I thought I could try and see if the issue also was present there and it wasn't! I added all my wallpaper folders into System Preferences and none of them disappeared... I even reinstalled with a clean install ML on my MBP and the issue didn't go away. I purchased an app called Wallpaper Wizard that changes the wallpaper automatically and to which you can upload your own wallpapers (plus a massive selection they already have) and that's what I'm using right now until Apple solves this...

Yep, I'm too am having the same issues with my 27" iMac. I've had it for such a long time. The only thing is, and I'm not sure if it's related. But "Find My Mac" bug also poped up at the exact same time. I can't enable it because it says "Recovery Partition required".

Still no fix huh? This is anoying.

Ok, so I just formatted my iMac, reinstalled Lion, then upgraded to ML, still no problem, then restored from my time machine. BAM, bug is back. So I did it again, this time I only restored my personal files and nothing else, no system settings or anything else. BAM bug came back again. So thats gay, the time machine is corrupt with that bug now. But atleast my other problem regarding Find my Mac is working now.

WORKAROUND:

Hey All. I too am having this issue on my Macbook Pro with a clean install of Mountain Lion. I did not back up from time machine or import settings from any other backup. So when I say clean, I mean clean. And yet, when I add a folder to Desktop settings, it disappears once I close out of preferences. The work around was to import my pictures into Iphoto and choose a picture from there in desktop preferences. That seems to be the workaround and it will keep the picture you chose in between bootups. Hope that helps for now...COME ON APPLE!!!!