samba - Sep 2009 - Printing from Vista/W2K8 with 3.4 Print Server

I have a Samba 3.4.0 print server with WinXP, Win2K3, Vista, and Win2K8 
clients. The print server functions fine with WinXP and Win2K3. The 
drivers show up properly  and if you look in server properties from 
those clients you can see the Samba printer port, the drivers, and print 
forms.

However under Vista and Win2K8 server I get nothing. The clients say 
that the drivers aren't installed, and when I go to look at the server 
properties on either client everything is blank. There is no Samba print 
port, no print forms, and the installed drivers show up as a couple 
characters of gobbelty-gook.

I haven't been able to discern any errors when looking at the log files. 
Anyone have some insight? Help is much appreciated.

Neil