I have an issue where newly created users do not appear in the login window. I tried changing it to username and password to enter in the username/password combinations manually, but the login fails. In addition, trying to set 'Automatic login' as these newly created users fails (password is rejected). Using the resetpassword utility in the Recovery mode, I can see all of the newly created users. I tried resetting the permissions/password, but to no avail. I did a reinstall of Lion OSX, but my problem still remains. What's worse is that I cannot log in as the root user, even though su in Terminal works. What else should I consider at this point? I can't find anything else relevant on Google. For more background information, the Mac is a repurposed server machine (ran Lion Server). However, this issue was present even before removing Server (and in any case, I have reinstalled Lion OS on it).