http://fixunix.com/samba/142062-samba-windows-xp-userid-start-menu.html
"Also happens with an NT 4.0 domain controller, so it might not be a Samba problem at all ;-)."
Well... Thank you for the link! (I still would like to have some more hints about the causes...) -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
