Messes up embedded media like YouTube

After adding this module and using it successfully for one post (which had no embeds), I wanted to edit a post that had embeds simply to change the taxonomy tags. Doing so changed the coding of the embeds so that they no longer appeared on the site. One was shortened to this:

<object height="295" width="480"><param name="movie" value="http://www.youtube.com/v/rytwGHd3iDw&amp;hl=en&amp;fs=1"><param name="allowFullScreen" value="true"><param name="allowscriptaccess" value="always">

which no longer showed the video in the post.

I tried multiple times to add the correct code back in. Once it did work but my attempts to center the videos with a div resulted in the videos disappearing again.