slow log on from mobile user

we recently changed our domain name and since then the log on from the users that have laptops which also have mobile accounts take like forever to log in. I have changed the settings in system preferences and in directory access to adjust for the authentication change. They will eventually be able to log in but it takes way too long. I was wondering if somewhere in their preference files stored on their laptops, there was some reference to the old domain? we are running OSX 10.4.10 server and 10.3.9 Mac clients Thanks for any help Bill