wish i could help you but iv never allow comments .. turned off ever since istarted using plogger ..
in theme/picture.php there is..
plogger_display_comments();
that includes.. THEME_DIR . '/comments.php ... to .. plogger_picture_has_comments .. to .. available_comments .. and i found:
// lets load up the comments for the current picture here as well $query = "SELECT *,UNIX_TIMESTAMP(`date`) AS `unix_date` FROM `".TABLE_PREFIX."comments` WHERE `parent_id`=".intval($id)." AND `approved`=1";
parent_id must be picture id .. so .. maybe move plogger_display_comments(); to theme/album.php ?
maybe change < input type="hidden" name="parent" value="'.plogger_get_picture_id().'" /> in theme/comments.php to album id?