[Samba] [homes] share problems

[Robert]

I am experiencing the following problems with the [homes] shares.
Using Samba 3.0.9 and winbind on SLES9 with NT PDC.
Running wbinfo -a authenticates users ok but I cannot connect using 
smbclient.
If I comment out 'valid users = %S' from [homes] in smb.conf then it is 
possible to connect using valid user/password combinations but otherwise 
I get
tree connect failed: NT_STATUS_ACCESS_DENIED

Could anyone please throw some light on this while I still have some 
hair left.
Thanks

Rob