samba - Jun 2006 - Problem with Windows 2003 AD and Samba 3.0.21

Hi,
We have had Samba version 3.0.21b and c working in Windows 2000 Active
Directory environment for a long time until one of the AD servers was
upgraded to Windows 2003. If a user is bounded to that Win 2003 AD, the
"net view \\sambaserver <file://sambaserver/>" will fail with
"System error
64 has
occurred." but strangely, if user uses the IP address of sambaserver,
everything is ok. At this point the workaround is to have the user his
PC several times to bind to a Win 2000 AD.
Is this something that can be fixed or have to wait until next Samba
release? Is it Samba problem at all or AD configuration?
This is all on Solaris 10, Samba 3.0.21b,c MIT krb 1.4.3, openldap
2.3.20
Thanks for any help.