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Every time we change the setting on an iMac running 10.6.8 to not log out after X number of minutes the preference seems to reset to log out after 55 minutes. We don't want the computer to log out as we are running a looping movie and the computer sees this as no activity.

As soon as we change System Preference panes the log out after X minutes resets to being selected and set to 55 minutes. does any one know how to disable this feature/preference? or know what plist needs to be replaced (assuming that the plist is corrupted and will not hold changes)

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Hopefully you have solved this issue on your own, if not however, the .plist file you are looking for is /Library/Preferences/.GlobalPreferences.plist. Of course you will have to be able to view hidden files to access this particular plist. The value you are looking to change is for no auto logout this value should be 0.

If all else fails you should be able to use this command on terminal

sudo defaults write GlobalPreferences 0

That should override and set the delay

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if this doesn't work have a look at Caffeine – konqui Jul 13 '14 at 8:48

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