Did you copy+paste from a Word document or something? This is not recommended, because Word adds heaps of junk to the text. See here:
http://www.photosjlboitte.be/bookphotos ... t/Accueil/
To remove Word formatting, first paste into notepad(win) or textedit(mac), and then copy again from this source and paste into the Imagevue text page. You should then do the formatting directly from the Imagevue Rich Text Editor.
The problem is likely related to using new paragraphs <p>...</p> for each new sentence, instead of separating new lines with single line-break <br/> instead. To achieve single line-breaks, click
shift+enter/return instead of clicking just enter.