$start = optional_param('formstart', 0, PARAM_INT);
$userid = optional_param('userid',0,PARAM_INT);
$courseid = optional_param('courseid',SITEID,PARAM_INT);
-$tag = s(urldecode(optional_param('tag', '', PARAM_NOTAGS)));
+$tag = optional_param('tag', '', PARAM_NOTAGS);
$tagid = optional_param('tagid', 0, PARAM_INT);
$postid = optional_param('postid',0,PARAM_INT);
$filtertype = optional_param('filtertype', '', PARAM_ALPHA);