[Samba] Samba 4 does not survive a restart

[steve]

Hi everyone

The first time after a new build, Samba 4 works fine. After restarting, 
it doesn't.

openSUSE 12.1, bind 9.8.1-SP and Kerberos all working as per the samba wiki.

sudo samba -i -M single
root's password:
samba version 4.0.0alpha18-GIT-bfc7481 started.
Copyright Andrew Tridgell and the Samba Team 1992-2011
samba: using 'single' process model
WARNING: no socket to connect to

Kill that and restart and there is /usr/local/samba/var/run/samba.pid 
but wbinfo does not work nor does smbclient.

What is preventing it from working? Where can I start to look?

Thanks.
Steve