MacBook Pro logout automatically in a few seconds or min.
My laptop is MacBook Pro (Retina, 15-in, Late 2013)
I had this problem after I completed software update this morning. Now it logout automatically in a few seconds ~ few minutes even during I was in the middle of scrolling pages. I checked the security & Privacy from system preference. It shows "require password 5 seconds after sleep or screen saver begins". The check box is disabled and I can't make adjustment. The odd thing is it logout/request password when I was doing something. The computer didn't sleep. The screen became black and I had to press power button to make it live and re-login. I can't do anything except keeping login. Please help.