Results Slide and retry Quiz

I have set up a question bank with true or false questions in my course.  My bank is set up with 17 questions, but the employee only needs to complete 10 (this seems to working). Everything seems to be working fine - I can take the course and get to the results slide. But when I try to retake the quiz and click on the "retry" quiz button.  I have the "retry" button going back to my question bank slide. I go back to the quiz questions but I can not click either the "true" or the "false" button.  When I click next the program advances to the next quiz question. I am sure there is some little button I need to enable - but I am not sure where to go. 

Can someone please give me a tip.  Thanks