Rules with monitor

[Steven Hum]

I'm doing something wrong here.. I have a simple rule defined as

hc rule class=Vlc tag=6 monitor=0 focus=on switchtag=on

Invoking vlc opens it the designated tag but not on the desired monitor 
-- tag 6 appears on whichever monitor is in focus. 
"swap_monitors_to_get_tag" is 0 (if value is 1, the tag is not raised).

"list_monitors" yields

0: ... with tag ...
1: ... with tag ...

Am I missing something?

Regards,
Steven