I have a Macbook Pro running mavericks with the latest apple updates. All of a sudden it logs itself out after 1800s

We have a macbook pro running an up-to-date installation of Mavericks. We do not want to upgrade to Yosemite yet due to our management software still ironing out the differences. Its possibly a bug introduced in a recent update but for some reason over the passed 3-4 weeks we have a macbook which is logging out after 1800s of inactivity.

We do not set this centrally and after some digging we found its set in the global plist. We change it and it changes itself back. we have extended the time and this goes back to 1800s and we have disabled this setting. We have even deleted the global plist and re-booted and its back with the 1800s setting.

I wondered if anyone else had encounter this and possibly ironed it out. Its a strange one.
James WilkinsonNetwork ManagerAsked:
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James WilkinsonNetwork ManagerAuthor Commented:
There was a setting in workgroup manager which effected all MacBooks :(

This is now working
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SimonCommented:
Have you looked in System Preferences/Security and Privacy/Advanced ?
Screenshot showing logout after period of inactivity.I don't recall setting this myself, though I possibly did it a few OS  versions ago. At least mine is 960 minutes so it doesn't bother me. I can't recall whether it is a 'energy saving' eco default, or whether I used it because I used to have scheduled startup and shutdown.

I'm guessing that the plist is being reset every time the system shuts down when it is read back from the running config.
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James WilkinsonNetwork ManagerAuthor Commented:
We will take a look at this. Thanks for the quick response. We would not set this on purpose but i guess something could of somehow triggered it. We do a lot of central scripting to change settings so something could of caused this. I will check it out on monday
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James WilkinsonNetwork ManagerAuthor Commented:
We found the issue and fixed it
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