I cannot get my preferred images to remain on the desktop.  Through preferences I choose an image and it disappears each time I turn the computer off: why?  And how can I stop this?

When I go to 'desktop' in system preferences and choose an image for the desktop, it disappears when I turn the computer off.  Why is this?  And how can I get an image to remain until I choose to change it?  It acts this way whether I click 'change' or not.

If you log in automatically, a known bug will cause the desktop picture to revert to the default image of a galaxy at every startup. The only workaround is to disable automatic login in the Users & Groups preference pane.
If the desktop picture always reverts to a plain blue background, one of your login items may be causing the problem. The "Team Viewer" application has this effect, as reported by ASC user Zimmerwald. If it's not that in your case, rule out all other third-party login items as possible causes.
According to one report, a "stuck" desktop picture setting can be fixed by changing the setting and then immediately rebooting. I can't confirm, but there's no harm in trying it.
If none of the above applies to you, proceed as follows.
In the Finder, hold down the option key and select
Go ▹ Library
from the menu bar. From the Library folder, delete the following item, if it exists: 
Caches/com.apple.systempreferences
and move the following item to the Desktop:
Preferences/com.apple.desktop.plist
Launch System Preferences and test. If you still have the issue, put the item on the Desktop back where it came from and post again. Otherwise, delete the item.

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