Media inserted in popup pro doesn't show

Hi folks,
We are using popup pro to announce a big sale, and want to embed media in the message body of the popup, rather than using the popup featured image insertion method. The result is the image doesn't show in the preview and gives an odd url reference in the browser's footer when the (missing) media is hovered over. the odd url for the missing photo is"http://[the link to the media appears here]". Is this an issue of the previewer, or is there a problem. We don't want to activate the popup with this issue.