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This is driving me insane. The checkbox in System Preferences > Security & Privacy > General Tab > Advanced > Logout after X minutes of inactivity turns itself back on whenever I move away from the settings screen. I recorded a gif to illustrate this:

Sorry for the low quality

Anyone knows why this is happening? Is it some new antivirus setting? Some remote setting? Some MacOS setting? Btw I'm running latest El Capitan

EDIT

I tried using Automator to disable this again every 5 minutes. Didn't work haha. I was also able to figure out the file where this particular pref is saved, running sudo fs_usage -w. It's here:

/Library/Preferences/.GlobalPreferences.plist

running defaults read shows me the preference is AutoLogOutDelay

If I run:

sudo defaults write /Library/Preferences/.GlobalPreferences.plist com.apple.autologout.AutoLogOutDelay 0

The computer freezes for 5 minutes. I have no idea what's going on

Edit 2

Found a thread from Apple discussions. The last message in the thread points to Profile Manager, General > Login Window > Options I will try to check with the network manager.

No, it's off there too. Looking further into fs_usage I noticed something strange. A process VShieldScanner.3263 is editing the preferences, namely McAffee ... 😠

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    Have you tried "locking" the changes? (click the padlock to the right of "Advanced" when you make the change) – Allan Oct 13 '16 at 13:47
  • Yes, this has no effect :( – luksfarris Oct 13 '16 at 14:31
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    Is there anyone else who has administrator access to your computer, and/or anyone who might have some management over it (such as it being on a corporate network)? – tubedogg Oct 13 '16 at 17:40
  • Yes, it is, but I am the only one facing this issue. I will ask the administrator. In the mean time, I found a temporary solution. Xcode prevents logout, so keeping it open partially solves the problem. Still very frustrating – luksfarris Oct 14 '16 at 13:19
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It was a bug in McAffee 😠

Updating to version 10.2 fixes the problem

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