White screen on wake up & screen saver

Question

On March 25th, 2013, I updated from Lion 10.7.5 to Mountain Lion 10.8.3.  I began to get the white screeen on wake up that others have posted about.  I tried several of the fixes that were suggested with no success.
My normal set up for screen saver and energy saver is as follows:
Screen saver comes on at 5 minutes using Slideshows/Snapshots which pulls photos from PhotoStream.  At 10 minutes, the computer sleeps.  When I press the space bar to wake up the computer, I get the white screen.
I experimented as follows:
I turned off the screen saver completely and did not get any white screens.  Then I put the screen saver on utilizing ScreenSavers/Flurry, and did not get any whote screens.  I then went back to my normal set up as described above, and the white screens returned.
So in my particlar situation, it seems the white screen problem is only related to using the Slideshows with pictures from PhotoStream.  Not the most scientific de-bugging approach, but perhaps this will help someone to discover a solution.

Answer 1

Reinstalling Lion Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion and click on the Continue button.
Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.