I locked my MacBook to clean the keyboard. While cleaning I pressed a number of keys in a random way while the system was displaying the login screen. At a certain point I noticed a light-blue double frame around my account icon and its name.

It wasn't user selection which is a square shadow behind the user icon (selectable with arrow keys). When I confirmed the selection and the screen changed to the password login prompt, the blue frame disappeared.

It was around the account I had been logged on to before switching to the login screen.

I tried lock the screen again and repeat the process, but could not get the blue frame to reappear.

The question is: what is it? And how to repeat the process?

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I included two screenshots to show that the user selection is separate from the blue frame.

  • 1
    You found a new secret door :) ! Did you notice the blue square frame around your head? – dan Jul 21 '16 at 14:53
  • This is really something I've never seen before. Just try contacting apple at getsupport.apple.com – owlswipe Jul 21 '16 at 14:57

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