Hi HITC eLearning,
Thanks for reaching out and I'm sorry to hear you've hit this snag!
It sounds like you've followed these steps while publishing your course for web distribution. You mentioned the index.html file works fine. Can you share a link to that index.html file with learners? Have you tried using a different browser?
If you're comfortable sharing your file with us, I'd be happy to test it out. You can upload it here or privately in a support case, and we'll delete it from our systems once troubleshooting is complete.
