Since Thesis uses its own framework which handles the creation of the <head> </head> section of the web pages created by WordPress in a non-standard way, the CSS style sheets for the Thesis theme “bleed through” and cause a conflict with the WP Sales Page CSS style sheets.
This conflict makes breaking paragraphs a bit of a trick. However, you can force a paragraph break by entering the following code on a blank line between your paragraphs:
<strong> </strong>
Yes, that is the equivalent of making a blank space “bold”, but it works. Use the HTML editor to apply this workaround.