Aha, this is because you look at the latest comments album,
there is an easy fix for this,
replace the second part of the update with this one:
#################################################
//Second part of lightbox update
function lightbox_list($picId) {
global $lang_display_image_php;
$i = 0;
$pid = $picId;
$pic_data = get_pic_data($_GET['album'], $pic_count, $album_name, -1, -1, false);
$firstonly = true;
foreach ($pic_data as $picture) {
if($CONFIG['thumb_use']=='ht' && $picture['pheight'] > $CONFIG['picture_width'] ){
$condition = true;
}elseif($CONFIG['thumb_use']=='wd' && $picture['pwidth'] > $CONFIG['picture_width']){
$condition = true;
}elseif($CONFIG['thumb_use']=='any' && max($picture['pwidth'], $picture['pheight']) > $CONFIG['picture_width']){
$condition = true;
}else{
$condition = false;
}
if (is_image($picture['filename'])) {
if ($CONFIG['make_intermediate'] && $condition ) {
$picture_url = get_pic_url($picture, 'normal');
} else {
$picture_url = get_pic_url($picture, 'normal');
}
$picture_url_fullsize = get_pic_url($picture, 'fullsize');
$pic_title = ($picture['title'] ? $picture['title'] : strtr(preg_replace("/(.+)\..*?\Z/", "\\1", htmlspecialchars($picture['filename'])), "_", " "));
if ($picture['pid'] == $pid && $firstonly) {
$picList .= "<a href=\"$picture_url_fullsize\" rel=\"lightbox[list]\" title=\"$pic_title\">";
$picList .= "<img src=\"$picture_url\" class=\"image\" border=\"0\" alt=\"$lang_display_image_php[view_fs]\" /><br />";
$picList .= "</a>\n";
$firstonly = false;
}else{
$picList .= "<a href=\"$picture_url_fullsize\" rel=\"lightbox[list]\" title=\"$pic_title\"></a>\n";
}
$i++;
}
}
return $picList;
}//End of second part
#################################################
The multiple pics where shown as the picture exists multiple time in that album.
It will now only show the picture 1 time, but it will show multiple times in the slideshow.