Publishing to HTML5 receiving warning message and blank page

Hello.

I am trying to publish my content (saved on a shared drive) so that someone without captivate can review it. They were able to open the HTML file last week but they tried today and received a security warning about it being a potentially unsafe file and a blank web page.

I tried to republish the content from my computer and from the shared drive and I get the same thing.

What could be going wrong here?

I am new to Captivate and publishing. Thanks.

I should note we are using a PC and a limited access computer on a client site.