Screen Saver on 10.8.3 Fails to Activate

I have started this discussion because my system screen saver is failing to activate again.  This problem started when the 10.8.2 update came out. Before then the screen saver worked perfectly. After 10.8.2 it almost never worked. Finally (I thought) after updating to 10.8.3 the screen saver began working again. I downloaded 10.8.3 on March 14 and it worked perfectly until March 23, when I discovered that it failed to activate, leaving the screen unprotected for over 8 hours. Since then, it has been working, but I fear that this problem has not been fixed.
Is anyone else still having this problem?

Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
Feedback
What happens if you delete the .plist?
You need to look in your user Library/Preferences for the .plist. Hold down the option key while using the Finder "Go To Folder" command. Enter ~/Library. Delete the .plist(s) for the application.
If you prefer to make your user library permanently visible, use the Terminal command found below.
http://osxdaily.com/2011/07/04/show-library-directory-in-mac-os-x-lion/
You might want to bookmark the command. I had to use it again after I installed 10.8.2. I have also been informed that if you drag the user library to Finder it will remain visible.

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