Probably, the user account for nworks connection to vCenter does not have the required permissions. We can use Read-Only account for almost all VMware data - but for this new hardware method, we need one specific permission. It is called 'CIM Interaction', you can add this to the Role you are using in vCenter for nworks connection account.
For details on this new permission, please see MP Installation Guide, page 8 'Accounts and Privileges'.
If you dont set the above permission, then nworks will default back to using the 5.6 method of getting hardware data from vCenter. That's why you would still be seeing Refresh Hardware events in VI Client.
Hope that helps!