Q&A: Problem with user profiles

Hi .. I've got Q&A installed with Buddypress 1.5 and using your Studio theme.

When a user posts a question I'm seeing their avatar and linked username just below the question. All good except the link associated with the username is of this format and generates a 404 Page not found error:

When I go to the buddypress member profile all is good:

Do i need to do an additional step to integrate this into the Studio theme? Or should it be working out of the box?