With audio and video, Lectora publishes so that Flash is the preferred player, and if not present, it will use HTML 5 to play the video. In Internet Explorer (only), the Flash player is an ActiveX control. It sounds like that when ActiveX is disabled, Internet Explorer won't let the Flash player run, but it tells the course content that Flash is available.
You can work around this, if your browser has HTML 5 support. Try this library object at the top of your title:
http://community.trivantis.com/shared-content/use-html-5-media/
This will switch the "preference" for Flash in the published content.
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