samba - Sep 2004 - WindowsXP SP2 shuts down while trying to log into samba 3.0.6 domain

Hello,
I have few Windows2000 Pro samba domain members which logon to the domain
without any obstacles. Recently I decided to upgrade all client workstations
to WindowsXP SP2. Fresh copy of WindowsXP joined domain properly but when I
tried to logon as usual it accepted password and shut down after a while
(logs of samba confirm that workstation logged on). Windows claims that
winlogon caused exception in msgina.dll lib.
Did anyone expirenced similar problem ?
TIA R.W.