I have a 13" macbook from 2009 and for some reason can no longer change my desktop image by just clicking on an image in system prererences I-Photo. Does anyone know what the problem could be?

I have a 13" macbook from 2009 and for some reason can no longer change my desktop image by just clicking on an image in system prererences>I-Photo. Does anyone know what the problem could be?

Your Desktop Picture settings and Dock items are stored in the files
/Users/your short user name/Library/Preferences/com.apple.desktop.plist and
/Users/your short user name/Library/Preferences/com.apple.dock.plist
in the "Preferences" folder in your user library. This looks like the system has trouble to write to these files. Check the permissions on your user library and remove the above files from your user library, then log off and on again.
Your user library is hidden in Lion and Mt. Lion. To reveal it, use the Finder's "Go" menu. Select "Go" in the Finder's main menu bar and hold down the alt/option key, until you see the "Library"  in the drop-down menu. Double click it to open a Finder window, so you can browse the files inside.
Regards
Léonie

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