Apache - groups - can anyone explain this?

["Ron Rademaker" <r.rademaker@virtualbuilding.nl>]

Hello,

If anyone could tell me how this is possible... Please do because I have
no idea:

My apache runs as user / group www-data / www-data
I got
	<Directory />
		Options ExecCGI
	</Directory>
Within my VirtualHost
When I try to access: index.cgi on this virtualhost -> Forbidden
Logs tell me: file permissions deny server execution
When I: su - www-data
	  ./index.cgi		
	  It works!

The file permissions are: 770, www-data is in the group owning the cgi
This happens to ALL my cgi-scripts....

Thanks,
Ron

PS. Could you please cc any replies to me?