For some reason you have yet the code but is not showing:
Try to change:
HTML Code:
<div class="fullwidth article_preview_contents<vb:if condition="$showpreviewonly"> showpreviewonly</vb:if> restore">
<vb:if condition="$showpreviewonly">
<vb:if condition="$previewvideo">
{vb:raw previewvideo}
<vb:elseif condition="$previewimage" />
<a href="{vb:raw page_url}">
<img class="cms_article_preview_image" src="{vb:raw previewimage}" alt="<vb:if condition="$attachment_settings['alt']">{vb:raw attachment_settings['alt']}<vb:else />{vb:rawphrase article_preview}</vb:if>" <vb:if condition="$attachment_settings['title']">title="{vb:raw attachment_settings['title']}"</vb:if> /></a>
</vb:if>
</vb:if>
<div>
<br />
<div class="cms_article_txt_content postcontainer">
{vb:raw previewtext}
<vb:if condition="$preview_chopped">...</vb:if>
</div>
</div>
</div>
FOR:
HTML Code:
<div class="content">
<vb:if condition="$previewvideo">
<div class="videocontainer">{vb:raw previewvideo}</div>
<vb:elseif condition="$previewimage" />
<a href="{vb:raw page_url}">
<img class="cms_article_preview_image" src="{vb:raw previewimage}" alt="{vb:rawphrase article_preview}" width="270px" height="150px"/></a>
</vb:if>
<blockquote class="postcontent restore">
{vb:raw previewtext}
<vb:if condition="$preview_chopped">...</vb:if>
</blockquote>
</div>
OR DELETE THE CONDITIONAL.
HTML Code:
<vb:if condition="$showpreviewonly"> </vb:if>