PB17 sleeps due to automatic logout

Does anyone here know how to turn off automatic logout? My PB17 goes to Screen Saver after 15 min, but if I've been in class for an hour and come back to see if I have any messages, my computer is on a black screen and wont go back to the desktop. I have to force shut down-restart the whole thing. This is getting VERY old. Sometimes, depending on what programs are running, the automatic logout is cancelled due to a certain program. Is there a way to fight this so I can have my computer running more than it is now?
Aaron

You can disable automatic logout from the Security pane of System Preferences.
(9070)

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