If you encounter an issue where a user changed their password recently and they cannot login to their computer encryption system then do the following actions when logged in as an administrator:
Open the Terminal application (click the magnifying glass in the top right and type in terminal).
Type in the administrator password
Restart and have the user try to login again.
sudo fdesetup add -usertoadd <UFNET USERNAME>
Hit enter, and type the following for the prompts:
Enter the user name: administrator
Enter the password for user 'administrator': <ADMINISTRATOR PASSWORD>
Enter the password for the added user '<UFNET USERNAME>': <UFNET PASSWORD>
Restart the computer and have the user try to login again.