CentOS - Sep 2014 - Zabbix on CentOS: system.users.num question

Hi.

I have installed Zabbix 2.2.6 on CentOS 6.5.

Question not too relative to CentOS, but hope somebody can help with it.

All triggers works correctly, but venti:system.users.num.last(0)}>0 - 
dont't.

Screenshot one: http://i.stack.imgur.com/YM9mu.png
And second one: http://i.stack.imgur.com/TMNqx.png

 From manual 
https://www.zabbix.com/documentation/1.8/manual/config/items?s[]=system&s[]=users&s[]=num
we see, that:
> Command who is used on agent side.
who on box side:

14:29:44 [root at venti /tmp] # who
setevoy  pts/0        2014-09-15 14:15 (85.*.*.15)
setevoy  pts/1        2014-09-15 14:15 (:pts/0:S.0)
...

# who | wc -l
11


Thus - system.users.num must be > 0 now.

What I'm doing wrong?

1th at setevoy.kiev.ua ????? 2014-09-17 18:42:
> 
> What I'm doing wrong?
Sorry, found problem - Item was disabled :-D
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