Profiles Forces Inactivity Logout

Hi,

I enjoyed the Mac OS X Server at Home book. I created profiles and pushed them out to some Macs as per the book. 

Since then, the user is automatically logged out after 30 minutes of inactivity. 

These Macs are at home and the log out is completely unnecessary and actually annoying. I know that the inactivity logout setting is found under the Advanced sheet in "Security and Privacy". But, where is this option set under the profile? Every time I fix the setting manually, it reverts to the profile and my changes are undone.

Thanks.

AG