I don’t have the ability to test this since I am using it as a widget but try this:
<?php if (function_exists('wpp_get_mostpopular')) wpp_get_mostpopular(post_html="<li>{thumb} <a href='{url}'>{text_title}</a> </li>"); ?>
Hope that helps.
In wpp.css
.wpp-list li { /* LI - post container */
overflow:auto;
display:block;
float:none;
clear:both;
/* ADD THIS */
margin-left: 0;
}
I had this same issue. It appears there is an option under widgets for the Popular Posts plugin -> Thumbnail settings -> Display post thumbnail
It has be checked. I discovered this after sifting through code for an hour o.O Hope it helps.