samba - Oct 2003 - cannot change user password ion domain logons

Hi all,
we have a domain of win2k pcs controlled by samba. After domain logon is
made by a user, the user cannot change his/her password. On the win2k side
the following error message is written

The system cannot change your password now because the domain STUDENT is
not available.

On the pdc side(running openbsd 3.2), the following is written in the logs

/usr/ports/net/samba/stable/w-samba-2.2.8.a/samba-2.2.8.a/source/lib/util_sec.c:
assert_gid(114)
Failed to set gid privileges to (0,32767) now set to (32767,32767)
uid=(0,32767)

/usr/ports/net/samba/stable/w-samba-2.2.8.a/samba-2.2.8.a/source/lib/util.c:
smb_panic(1094)
PANIC:failed to set gid.

Is there anyone who met with this problem and solved it? Thanks in
advance.