There is only one known issue between BPS and WPML here: http://forum.ait-pro.com/forums/topic/wpml-cant-deliver-via-xmlrpc/#post-1056 As far as how WPML works or any settings in WPML you would need to contact the WPML folks for help with WPML. If WPML uses some custom htaccess code then post that htaccess code so I can tell you where you would add it in BPS Custom Code.