It is actually in /wp-content/themes/infocus/framework.php. On line 138 you should see this,
add_action( 'template_redirect', 'mysite_enqueue_script' );
Immediately after that add this line,
if (in_array( 'wp-e-commerce/wp-shopping-cart.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) )) { add_action('mysite_head', 'mysite_enqueue_script'); }
And around line 202 you should see this,
add_action('wp_head', 'msmw_checkout_remove_filter');
Immediately after that add these lines,
function msmw_checkout_remove_filter() {
global $post;
setup_postdata($post);
$page_id = get_the_ID();
$post_content = get_post($page_id);
$post_check = strpos($post_content->post_content, '[shoppingcart]');
//if ($post_check > 0) { remove_filter( 'the_content', 'mysite_formatter', 99 ); }
if (strlen(strstr($post_content->post_content,'[shoppingcart]'))>0 || strlen(strstr($post_content->post_content,'[userlog]'))>0) {
remove_filter( 'the_content', 'mysite_formatter', 99 );
}
}