The problem seems due to an Apple bug on machines with the nVidia GeForce 330 or 650 when a third party driver is installed.
One possible workaround you can try is to remove the screen saver preferences. These settings are stored in the ~/Library/Preferences/ByHost/ folder.
Remove the file with name like “com.apple.screensaver.xxxx.plist” and set your screen saver preference again. Hope this help.
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