When editing a page, text does not appear

Hi everyone, I am having trouble with a page on my website, https://www.publicintelligenceproject.org. We use WooThemes, I use a MacBook Pro with OS 10.9.2, and a problem I am seeing is that (as the screenshot attached demonstrates), my text isn’t appearing on the edit screen–even though on the actual page itself, https://www.publicintelligenceproject.org/resources, all the text displays correctly. I have also tried to use a previous revision, but it still didn’t load. My other pages load fine in the editor as well. I’ve tried editing in a private browsing session of Firefox (my main browser), as well as trying on Chrome. But no change.

Any help would be great!
Thank you.