I have _big_ problems with getting information about vlans, so... I have these information in database, but I can see them via WWW.
Can you provide the info from the tables 'swp_netbox', 'vlan' and 'swportvlan' (a few rows should suffice)?
select * from swp_netbox; select * from vlan; select * from swportvlan;
Also check the log files in the '/var/log/nav/networkDiscovery' directory.
After adding new ip-device, what should be done, to make cricket show all the stats?
I believe the script
/usr/lib/nav/makecricketconfig.pl
needs to be run.