This problem also appears to affect the home directory. The automatically created share is being created with the address
\\zserver1.MYDOMAIN.LAN\myname
which also cannot be resolved.
Additional information:
I set up a Windows Vista client. When first connected, it created \\zserver1.MYDOMAIN.LAN\myname and that was visible but a share using \\zserver1\sharename was not found,
but after logging in again, \\zserver1.MYDOMAIN.LAN\myname could not be reached but \\zserver1\sharename could be reached.