Wrong url in form submission in ucp.php

Hi, i recently installed the module successfully and everything is working great, except the user control panel is unusable because the form submits in a wrong url: domain.com/ucp.php?i=165 but it should submit in domain.com/phpbbforum/ucp.php?i=165, so upon submission i get a 404. I run phpbb inside drupal[no iframe] and when using the iframe the problem solves itself, but i do not intend using an iframe. the server is running postgresql, i use clean urls and i have followed the installation instructions carefully. Thanks.