Users login normally, but are prompted to change their password on login
time. They do so, and when they log in later in the day, they are prompted
to change their password yet again. The only time it seems to "stick" is
when they login, and change their password via cntrl+alt+delete and
clicking "change password".

Windows XP
4.91.0.20050216
NMAS 3.0.0.37
NICI 2.6.6-1