First get rid of bind-chroot (if it is installed!)
yum -y remove bind-chroot
edit /etc/sysconfig/named and remove/comment out any lines that look like ROOTDIR="/var/named/chroot"
Fix the owner of /etc/named.conf with
chown named:named /etc/named.conf
In Webmin go to Servers > Bind DNS Server > Module Config and check the following configs
BIND DNS Paths
Chroot directory to run BIND under: none
Is named.conf under chroot directory?: no
Zone file options
Directory for master zone files: /var/named
Directory for slave/stub zone files: /var/named/slaves
Owner for zone files (user:group): named:named
Restart named and you should be good to go.