The server is running Zabbix 1.6
There's no problem when monitoring a 1.4.x agent but when I use zabbix to monitor the zabbix server all the proc.num[] returns 0

Shell> zabbix_agentd -t proc.num[sshd]
proc.num[sshd] [u|3]
Shell> zabbix_get -s localhost -k proc.num[sshd]
0

but on distant server this works perfectly

Zabbix compiled on server with
./configure --enable-agent --enable-server --with-mysql

i've tested to install the server on an other machine running Gentoo 2.6.28-r5 kernel and i've got the same result.