samba - Sep 1999 - Samba 2.0.5a (Solaris 2.6) and NT SP5

Has anyone had a problem getting a samba share to mount on an
NT system with Service Pack 5 installed?  I have a share set up
with guest only and guest ok set to yes and guest account = xxxx
in the global section.  I can get this share to mount okay on
an NT system that has Service Pack 4 installed but not on the
NT system that has Service Pack 5 installed.  I have security = share
set.  I'm running samba 2.0.5a on a Solaris 2.6 system.

thanks,

mel bailey