Lock screen display not working properly on wakeup from screen sleep

I just purchased a macbook air top model mid 2012... yesterday.  It's brand new.  When I click the trackpad to wake up the screen after it sleeps and has auto-locked (not a computer sleep!  just a screen sleep), the screen is not all present.  I have to move my mouse around to reveal the rest of the screen.  Once I have done that enough to find my icon to enable text entry, I put in my password and I get back to the desktop which is then normal.  This behaviour is only occuring on a wake-up after screen sleep.  Seems like a video driver problem to me.  The only add-ons I have at the moment are alfred and bettersnaptool.  Has anyone run into this?  Is there a fix?  Also, I have applied all the latest updates.  I can't remember, but this might have begun after the latest update.
Thanks,
John

I believe this article describes the issue:
http://support.apple.com/kb/TS4135

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