When a reviewer performs a review, they sometimes need to drill down to see user details. In version 5, this was the default behavior.
In version 7, a reviewer cannot drill down to get user information - unless we give them the User:View All Privilege. However this gives them too much access - they can view details about any user - irregardless if they have a REASON to review them.
Solution?
See the answer for the following post - How to show/hide attributes in Popups?