Site with JA_Stark template. I updated to latest T4 version and noticed an issue viewing article intro image on Category Blog page. The class element of "figure" is not set to "pull-left" but it refers an anonymous "left". The problem seems to be the file plugins/system/t4/themes/base/html/layouts/joomla/content/intro_image.php.
I had to create an override in templates/ja_stark/html/layouts/joomla/content/intro_image.php modifying the row
<figure class="<?php echo $this->escape($imgclass); ?> item-image">
width
<figure class="pull-<?php echo $this->escape($imgclass); ?> item-image">