Are the accounts ACTUALLY configured on the computer?
Like, if you go to the users folder, do they exist? You can also check in the terminal by typing "dscl . list /Users" without the quotes. It will spit out the entire list of users. Don't be freaked out by this! You're just looking for the last few that should be recognizable.
If your users aren't there, then the prestage enrolment didn't complete and likely needs to be set up again.
HTH.
-Graham
