Course freezes for only some users

We have a course created with Articulate presenter.  For only a few users, the course freezes at a certain point and doesn't allow the user to advance.  One of the user has tried both Chrome: 11.8.800.170 and Internet Explorer: 11.8.800.175.  Several others have completed the course without a freeze.  The freezing users have tried closing and re-opening (with both resume and non-resume).  Any idea what could be wrong with these select user's configurations?

Thank you

Jill

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