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In Lion, I repeatedly uncheck the option to Require a Password after Sleep or Screen Saver Begins in Sys Prefs >Security Privacy> General but when I return to wake the computer, it requires a password and the option is re-checked even thought I have locked the page. This is on a iMac 20". I have a Macbook pro with lion and it does not behave the same way. Any fixes?

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Do you by chance have FileVault 2 enabled on your iMac? – jaberg Apr 13 '12 at 15:52

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