Quizmaker quiz keeps freezing up

I am having a problem with a Quizmaker quiz.  I have published a 10 question Quizmaker quiz that runs in our LMS without presenter.  Five questions have no audio or video, but 5 do have video.  After publishing and running a test, the quiz always freezes, but on different questions.  I am completely stumped.  I have tried shortening names of files to see if that is the problem and have also followed the link above ( http://www.articulate.com/support/presenter09/kb/?p=2347 ).

Any suggestions?

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