The PC boots to the Welcome screen and I enter the password. When I click the arrow icon to log in, nothing happens. (The icon changes in reaction to the mouse, but no login.)
I subsequently booted to safe mode (no problem logging in) and removed the password. It booted normally bypassing the Welcome screen. I then created a new user with a password; when I booted normally, it stopped at the Welcome screen. I was unable to log in either user.