[Samba] Samba 3.0.23 winbind use default domain = yes behaviour

[John]

Hello list,

I encountered a problem in Samba 3.0.23 regarding the winbind use default 
domain = yes behaviour.
It only works for the users an NOT anymore for the Group. So this make 
getent group to show NETBIOSDOMAINNAME/group which course mail squid 
configuration to fail. My squid configuration allowed access based on the AD 
groups, which are provided by Winbindd.
Tested distribution:
SuSE 9.0, CentOS 4.3
Samba build: Sernet 3.0.23
Is this a bug or is this by design? Does anybody know a way to getent group 
to honour the winbind use default domain = yes option?

Regards,
John
The Netherlands.