html

isn't html or xhtml supposed to use double quotes. http://www.w3schools.com/tags/tag_img.asp
I changed line 99 in my instalation to:

      return '<img src="/' . $current->url . '" width="' . $current->width . '" height="' . $current->height . '" alt="' . $current->name . '" ' . $tags . ' />';