Portions of the screen do not refresh

Screen is white after screen saver goes to sleep.  Desktop does not refresh when keyboard is used to wake.  launching an app will show in the window of the app with rest of desktop still white.  started happening after OSX update.

Resetting the PRAM didn't fix it.
I believe the problem lies in the screen saver that is active when the screen sleeps. I was using a slideshow screen saver and had the white screen problem...once I changed to a generic screen saver such as flurry, the problem went away. Try that and report back here.
Obviously the OS is not freeing up the video memory used by the slideshow. I would venture to say the problem is a perfect storm of the particular video card, processor and a slideshow screen saver.

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