The wall paper can't change, all the time it's the same

I have  a Mac with Mountain Lion OS X 10.8.4. I have a problem with the wall paper, if I change the wallpaper,  when the system restarts reappears the same all the time.
I can tried to delete the file com.apple.desktop.plist but the problem persist.

Triple click and copy paste each line below one at a time into Terminal and press enter after each line, some might say "doesn't exist" don't worry.
Do not type the entries, you might make a fatal typo. rm is very dangerous. Have a backup of your files off the machine.
rmdir Library/Caches/com.apple.systempreferences
rm Library/Caches/com.apple.systempreferences
rm Library/Preferences/com.apple.desktop.plist
Then Apple menu > Restart, open System Preferences and set your preferences.
If you still having problems, try other wallpapers from Apple only and test,
Then also run through this list of fixes and tests, there is something further wrong with your machines software.
..Step by Step to fix your Mac
Make sure to backup
Most commonly used backup methods

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