E-newsletter Sending BLANK emails

Hi.. I have created a new newsletter using this plugin, and it is set to send a welcome email to all new subscribers, but both new subscribers as well as sending it to myself as a preview is only sending a blank email with nothing but the background of the theme (handwriting) on it even after saving the newsletter several times.

Please advise, I must get this to work before I can cancel my current email subscription service or continue to use this one.