When I boot/reboot the computer it automatically logs onto the first (alphabetically) account.  It does not give me the window to choose an account to log on to.  It seems to default to the first account.  I have been in control userpasswords2 and have set the requirement for users control to enter passwords, disabled that and re-enabled that.  I have also disabled Sign in last interactive user and Display information about previous log on in the Group policy (gpedit.msc)