On 2 sites using same theme and configuration, I have a front page slider pulling content from pages. On one site, changing the post.php file to show the content instead of the excerpt allows me to use html in the slider text. On the other site with the exact same set up, it still gets the excerpt with none of the the html.
So one site shows html tags in the source code correctly, the other just shows the <p> tags.
Theme is BizCast by fthemes.