I have added a wsc5505 to NAV, but NAV only detects 2 snmpoid's for the switch. I have no problems with wsc2948, cat2950, wsc4006, cat4506, cat295024G
You can try to set the uptodate field in the netbox table to false to re-detect OIDs since it seems like the OID tester was not able to properly detect all OIDs. Use the following command:
UPDATE netbox SET uptodate=false WHERE ip='<ip>';
We should probably add a link to the IP device center for re-testing OIDs for a device.