Quizzes LTI Not Starting for Students

I'm relatively new to the Quizzes LTI beta group, so perhaps there is something I missed that someone can point out.  I want to provide training to some of our faculty on the new quiz engine, so created a sample quiz in a sandbox course and enrolled 5 test students.  My intent was to go back and complete the quiz as each student to demonstrate the analytic and moderation functions.

I created the quiz and acted as a student to take the quiz.  When loading the quiz as a student I get a perpetual loading notice.

I can click submit and get a perpetual "loading" notice again.  I tried this with several students both in Chrome (v.61) and Firefox (v.56) with the same result.

I went back to see what was submitted, and when I click on the student "submission" get the same loading notice.

Does anyone else have the same issue or have a suggestion on what I may be able to try differently?

Thanks