One more note. For me, selecting "switch user" from the user menu on the top right turns the screen black and appears as if its a lock screen (as noted by the OP). But moving the mouse or hitting the keyboard returns me immediately to my session without requiring a password.
One more note. For me, selecting "switch user" from the user menu on the top right turns the screen black and appears as if its a lock screen (as noted by the OP). But moving the mouse or hitting the keyboard returns me immediately to my session without requiring a password.