Custom Registration Page

Hi,
I'm trying to add some custom blurb to the beginning of my subscription/registration page. I put my blurb in and then the shortcode [subscriptionform] but when I load the page all I get is my blurb, the subscription form goes away. I remove my blurb and the shortcode and save my page and the subscription forms re-appear as if by magic. Is there something I'm missing?
Thanks,
Tom