Can't lookup users in new reports, Sent or Received Traffic for Users

Can't lookup users in new reports, Sent or Received Traffic for Users

We've just updated to the latest ERP build 4150 (installing latest SP beforehand too) then tried to use the two new reports, Sent Traffic for Users and Received Traffic for Users. On both reports we can't seem to populate with a username...the name field is greyed out and the "Select" link does nothing when attempting a lookup. Am I missing something, or would there be a reason why the lookup won't work?
 
Thanks in advance.

                  New to ADSelfService Plus?