I have a MacBook Pro running Mac OS X Lion which has a single local user (the local administrator account that I setup) and then the domain user setup on the laptop.
I've gone into "Login Options" under System Preferences > Users & Groups and set the option "Display login window as: Name and password".
When the laptop first boots, it has automatically selected the local admin account, and I don't see where I have the option to change users. However, when if I log into that local administrator account and then log out (without rebooting) it will allow me to enter the user and password.
Best Answer
I found that going into FileVault (make sure your logged in with the user that that performed FileVault) and Enabling the user fixed the issue.