Hi there,
Make sure that Captivate is updated to 6.0.1.240 or 6.1.0.319.
Is it happening in IE 9 or have you tested this in other browsers as well?
Please check this article and ensure there is no unsupported object in your project : http://helpx.adobe.com/captivate/using/publish-projects-html5-files.ht ml
Thanks.
