[Plugin: Taxonomy Images II] No output from ciii_category_images()

I am struggling…I have confirmed that I am passing the correct ID to the function, and I am within the loop (though this is a category list on a standard page). No output at all. Any ideas?

<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
			<div class="entry post clearfix">
				<?php
				$args = array('orderby' => 'name', 'order' => 'ASC', 'child_of' => 15);
				$categories = get_categories($args);
				foreach ($categories as $category) {
					echo '<div class="et-box et-shadow"><div class="et-box-content"><h1><a href="' . get_category_link($category -> term_id) . '" title="' . sprintf(__("View all posts in %s"), $category -> name) . '" ' . '>' . $category -> name . '</a></h1>';
					//if ( function_exists( 'ciii_category_images' ) ) {
					$tmpIDs = 'category_ids=' . $category -> term_id;
					ciii_category_images($tmpIDs);
					//}
					echo '<p>' . $category -> description . '</p></div></div> <!-- end et-box -->';
				}
			?>
			</div><!-- end .entry -->
			<?php endwhile; endif; ?>

https://www.ads-software.com/extend/plugins/category-images-ii/