Display will not come back up after waking up Pro

Several weeks ago I increased the Pro's memory from 2 to 4GB. Since that time when I wake up the Mac, the display, (Westinghouse) will be all white. I then must turn it off and back on after that it looks OK. The increased memory might not have anything to do with the problem.

The obvious question is, if you go back to the original 2 GB configuration, does the problem go away?

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