After a sleep period my iMac desktop background disappears, and when waking small segments reappear scattered on the screen. What's happening.

Running the latest upgrade of Mountain Lion and experience this problem. Would like some explanation of cause and solution.

The reply addresses a different problem than I am experiencing. Log out was not enabled on my computer.  I have tried the usual strategies: shutting down, disconneting power, reset the Pram and ran preferences repair from disk utilities.  It is not every time waking from sleep that this phenomenon is happening, but it has been as often as 3 times a day.  I usually click on preferences, desktop/screensaver, change the picture which then fills the screen properly, and then change it back to Galaxy.  That geves the right look, but it does not prevent recurrence of the problem.  This has been happening for 5 or 6 days now.  Once before the recent OS update, and several times after.  Thanks for the reply.  Any other ideas will be welcome. 

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