Sent Traffic & Received Traffic for Users - can't lookup user

Sent Traffic & Received Traffic for Users - can't lookup user

We've just upgraded to the latest ERP build (and latest SP is also installed) which provides the two new reports, Sent Traffic for Users and Received Traffic for Users (great idea by the way). However, the name field is greyed out on each report and when I click on the "Select" link to look up a user nothing happens. Am I missing something, or any ideas why the lookup won't work?
 
Thanks in advance

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