Quiz hangs for remote users

We are having difficulty with a Presenter course that was recently published. Everything seems to work fine for the internal users, but some - not all - external users are having issues.

The course starts fines, plays a couple of videos fine, and then hangs at the first Quizmaker quiz. I have not been able to get the course to work remotely in IE9 or in Firefox.

I am not sure what the next steps should be for troubleshooting. Does anyone have suggestions?

Thanks

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