[CentOS] CentOS 5.5: bind config is missing the slave zone definitions

Hi all,

I have two near identical CentOS 5.5 machines; both are running named
server (DNS). On one using system-config-bind I can easily define a
slave zone; on the other, it is a no go: it says the definition is
there, etc. but there is no corresponding file in
/var/named/chroot/var/named/slaves . Any idea why that would be? What
gives?

I use the simplest possible zone definitions - forward IN slave, one forwarder.

Thanks.

Boris.