With youtube flash api have the same problem, with the last frame, so it´s sure is a flex bug...
Today my fight will be different, i´m using an old version of greensock of an old proyect that was remade (sequels are never good, except back to the future film xdxd), and has not got this method. So just fingers crossed with the latest version...
Thanks a lot for all!! and goodAs!! See you!