Solved:
open qtranslate-slug-with-widget.php, look for the following lines:
function qTranslateSlug_category_link($link, $id){
//TODO: implement it!
global $wpdb, $q_config, $qts_use_language, $wp_query;
modify as follows:
function qTranslateSlug_category_link($link, $id){
//TODO: implement it!
if ( is_object($id) ) {
$id = $id->id;
}
global $wpdb, $q_config, $qts_use_language, $wp_query;
now it works
cheers
e.
