Ok, i have no working integration at the moment, so hope this will work:
Open admin/validateimages.php and find this part
$sql = "SELECT i.image_id, i.cat_id, i.user_id, i.image_name, i.image_date, i.image_media_file".get_user_table_field(", u.", "user_name")."
FROM ".IMAGES_TEMP_TABLE." i, ".USERS_TABLE." u
WHERE $condition AND ".get_user_table_field("u.", "user_id")." = i.user_id
ORDER BY $orderby $direction
LIMIT $limitstart, $limitnumber";
Replace it with
$sql = "SELECT i.image_id, i.cat_id, i.user_id, i.image_name, i.image_date, i.image_media_file".get_user_table_field(", u.", "user_name")."
FROM ".IMAGES_TEMP_TABLE." i
LEFT JOIN ".USERS_TABLE." u ON (".get_user_table_field("u.", "user_id")." = i.user_id)
WHERE $condition
ORDER BY $orderby $direction
LIMIT $limitstart, $limitnumber";
Jan