Hi
In the for what it's worth department.
I'm running version 1607 (OS Build 14393.187) and I have my computer set to not ask for the password at start and it's working fine.
So it doesn't appear to be a feature of the new build.
Have you tried setting it back to the normal setting, rebooting and then starting over and unchecking the bow again?
Sometimes that does work, no guarantees. LOL
Also any chance you typed in the wrong password when you did it?
And make sure the listed user that's selected in the window below the check box, is shown as Administrator.
Mike