Bug: Users answer is not displayed on the front end when reviewing a quiz.

After clicking on the quiz name of a completed quiz, a user is taken to the url reslts/alias. All of the quiz questions are displayed. The right column correctly displays the correct answers (with a green checkmark) but the left column is blank and does not indicate the answer the user selected.

This does not occur for my admin user, only for "registered" users, who have only permission to access the component and to respond to (take) quizzes. I suspect this may be a permissions bug.

I also confirmed that logging in as an admin and looking at reports:
report_details/alias?response_id=4, for example, shows the same type of view and the answers selected by the user for the quiz taken by a regular user show up correctly. This again points to a possible permissions issue.

Using Joomla 2.5.