[Plugin: Category Images II] Can't make the plugin work in "if ( have_posts() "

if ( have_posts() ) {
single_cat_title(); // Works
echo category_description(); // Works
echo ciii_category_images(); //Dont work, why?
}

Hope that you are able to help.

I really wanna use your plugin in a query of posts, but I only want to show the category image one time, and not every time I loop an post.