Engage Interaction Missing


I am working on my first Storyline project and have published my first draft.  I published to LMS using the email option so I could send out for content review.  Two people have been able to see and review engage content (one of the slides) and two others (including me) only see a blank screen -- otherwise the project is working fine.  We are all viewing html files - I also checked to see if the engage content was included in the zip file that has been extracted as a swf file and it was -- I saw this on another post. 

Any help would be great -- thanks!

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