Plesk 12.x / Linux :: DNS Zones Not Created On Slave Servers

I am setting up slave DNS servers using bind 9.8 on CentOS 6. I have followed the procedure here successfully: [URL] ....

The problem is that even if I see something like the following in named.run on the slave server (which implies the rndc connection worked):

received control channel command 'addzone xxxxxxxx.com { type slave; file "xxxxxxxx.com"; masters { x.x.x.x; }; };'
received control channel command 'refresh xxxxxxxx.com'
received control channel command 'addzone xxxxxxxx.com { type slave; file "xxxxxxxx.com"; masters { x.x.x.x; }; };'

I still cannot query any entries for that zone from the slave DNS server:

$ dig @y.y.y.y xxxxxxxx.com
; <<>> DiG 9.8.3-P1 <<>> @y.y.y.y xxxxxxxx.com
; (1 server found)
;; global options: +cmd

[Code] .....

I also do not see any zone files created anywhere on the slave server.