It seems I have some work to do involving the formatting of the text in the boxes so that it retains rich text properly. Unfortunately I just started a new job, so my time is a little short at the moment. As I have said in another post, I want to add some more features to the plugin (template messages, ability to select individual recipients, etc), but I would work on the rich text fix before I start any of that.
Unfortunately in the interim, I can only note that this is a bug that needs to be fixed. I'm sorry I can't get to work on it faster! :(