[Samba] Samba + AD etc.

[sysrm]

Hi all...

Im at the stage where:

Kinit works
Net ads join -U Administrator works (I can see the computer in AD)
Net ads user works
Wbinfo -u / -g / -t works
Getent passwd/group works

What I cannot seem to get working is when someone logs onto the domain, and
then tries to map a drive to the samba server, its like the credentials
arent getting passed onto samba, or rather samba is unable to look them up
properly.

Am I missing a vital step/componant?

Things like su - ADUSERNAME don't work, and neither does chown, chgrp
commands ( are they even ment to work?)

Any help, ideas, WHY HAVNT YOU READ THIS FAQ (I probably have in fairness)
gratefully received.

Cheers

Ross