iFrame wont populate in editor

I'm trying to embed a video / iframe code snippet in our blog, but after saving the text, the snippet is erased.
I've checked text filters for the admin user, and there are no setting to block iframes.
I've also turned off our RSFirewall plugin, and the iframe is still wiped out.
I've tried using a different editor (built in Easy Blog editor) and iframe code is still not saving.

What's weird is if you save the post, the iframe does show up in the browser, just not the editor...which makes it hard to change or edit things.

The iframe code is:
<iframe src="https://embed-ssl.ted.com/talks/amy_cuddy_your_body_language_shapes_who_you_are.html" width="640" height="360" frameborder="0" scrolling="no" webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe>

The post is here:
http://www.thepfathlete.com/blog/entry/posture-presence-personal-power

Please advise.