I had this same problem with custom icons. I found this code in simple-share-buttons-adder/inc/ssba_buttons.php:
// if running standard
if ($booShortCode == FALSE) {
// use wordpress functions for page/post details
$urlCurrentPage = get_permalink($post->ID);
$strPageTitle = get_the_title($post->ID);
} else { // using shortcode
// set page URL and title as set by user or get if needed
$urlCurrentPage = (isset($atts['url']) ? $atts['url'] : ssba_current_url($atts));
$strPageTitle = (isset($atts['title']) ? $atts['title'] : get_the_title());
}
I edited this to just use the first part of the if/else (i.e., $urlCurrentPage = get_permalink($post->ID); and $strPageTitle = get_the_title($post->ID);), and that seems to get what I needed.