[Users] smbios hook

Hi I have a 2 node hosted engine cluster using 3.4 beta3 on centos 6.5 and I'm trying to use smbios hook(first try to use a hook) and I can't see the smbios key in custom properties when I edit a VM. I have installed the vdsm-hook-smbios on both hosts and restarted vdsm and restarted the engine as well. I can see the hooks available on each hosts from the engine GUI but I can't see the custom property to modify at VM level. Can anyone advise if I'm doing the right thing here or what logs should I provide for debugging ? Regards Liviu