the path to the current Desktop picture is stored in theDesktop preferences file in your User Library:
You may want to trash the file:
from your User Library and then log off and log on again. But this will require to rest all Desktop preferences again.
In Mt. Lion your User Librry is hidden.
To reveal it in the Finder, open Finder, select Go > Go to Folder, type ~/Library/Preferences and delete com.apple.desktop.plist
That is puzzling. Your User Library (the foler Library in your Home folder) is hidden but not the folders inside the Library.
Try a different way to show your User Library:
- Click on your Desktop to bring the Finder forward.
- Go to the main menu bar and select the "GO" menu entry.
- Hold down the alt/opt key ⌥, until "Library" appears in the drop-down menu.
- Select "Library" to reveal and open the folder.
- Then scroll don to the "Preferences" folder and remove com.apple.desktop.plist
Does that work?
Is there sort of a Master Desptob backround?
There is an alias to a Default Desktop in your System library:
and that should link to:
I would not touch these links, however.
Since problem occured again after restarting, remove the systempreferences. plist as well:
See this User Tip:
thank you for the additional idea, unfortunately it was not successful. Somehow the desktop picture is still returning to an old one. The interesting fact is, that this desktop wallpaper was never a wallpaper on the machine, I now have the issue with. It was on my old laptop some month ago. I migrated all information from the old machine to the new one.
It is bothering, but not to bad to go to the genius bar with the machine.
Anyway, thank you for your ideas and help