rc-pppoed installed - now problems with susefirewall2

hi list, i've just installed pppoed from roaring penguin and it works fine - since the susefirewall2's fw_masq_tcp does not :-( web-requests on port 80 are successfully routed through the box to my internal webserver and back, but other ports dont work (ftp on 21 e.g.) any more. nothing changed in firewall2.config. a clue? thanx in advance.