First make sure that all of your workstations are joined to the domain, that your smb.conf file points to the correct domain controller, that the ldap password is setup on each of the workstations, and that the Domain SID is added to the secrets tdb. Running testparm should indicate that each of these machines are at least a member server.
Second your exports file should look something like:
jslittl@fp3lb:~> cat /etc/exports
If you make changes issue the command:
It will return without output if no errors
When you say that you are logging into the console is the method that you are using (ssh, telnet etc) setup to authenticate against the ldap server?
Also make sure that the file system modules are installed on the local machine that are the same as the file system on the master machine. You might also check and see if kde requires some sort of vfs library like gnome does.