Go to Configure>Services>Inventory Tab and select unknown items. From there, allow the new item you want to see.
Blocked items is empty and block items is unchecked.
Don't forget to click on "make available to clients" in the "Manage Software List" plug-in. That will create a new ldappl for the clients to download and will let them know to pick up the new data.
You could check the ldappl3.ini file in the ldlogon folder on the core to verify that your new item is in there (just like in the old days).