Problem when setting group policy for locking computer

I just added a group policy to lock a computer so that when the computer is idle for 4 hours it requires the user to log back in.  The group policy I enabled is under User Config -> Admin Templates -> Control Panel -> Display.  I enabled Screen Saver timeout with a timeout setting of 14,400 seconds and I enabled Password protect the screen saver.

A few users have complained that if they walk away from their computer for 15 minutes, when they return they need to unlock it with user name and password.

What settings do I need to change so that it will lock only after 4 hours (14,400 seconds) of inactivity?

I am using Windows Server 2003, some clients are XP and some are Windows 7.
GreyHippoAsked:
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Michael PfisterConnect With a Mentor Commented:
Check if the affected computers enter standby mode (power save).
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