Problems previewing when text is right-to-left

Hi, I'm working on a project for the Red Cross wich is about to be translated into Arabic.

Everything works fine, until I try previewing the course. Once I've set the text setting to right-to-left the slide won't preview. The same when I try to publish a review link.

Attaching some screen shots. It previews fine when the text is left-to-right. When changing to right-to-left the text seems correct in edit mode. But when previewing it just stops with the preloader.