When I access my LMCE core via Samba with my Mac, I have a similar issue. But only with my Leopard machine. The additional drives show up as shortcuts which result in an error when clicked. I can, however, open them all with my Mac running Tiger.
So i have written it off as another one of the numerous problems that the Leopard upgrade installed on my Mac. maybe we will be luckier with 10.5.3