Screen saver and screen sleep not working consistently

Recently with one of the most recent updates my screen saver and screen sleep stopped activating when they should.  Sometimes I leave the room and come back an hour later only to find my screen is on and no screen saver.  I have screen saver set for 5 minutes and screen sleep set for 10 minutes (regardless of battery or plugged in state).  I have tried changing them and reserving to no avail.  Any way to fix this?
Thanks.

When was the last time you restarted your computer or even repaired permissions?
Try trashing the ~/Library/Preferences/ com.apple.systempreferences.plist file and restarting the computer.

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