BuddyPress.org

Hello folks,
this is Davide from Italy. I am a bbpress newbie, but quite experienced with WP and BBpress.
I was able to get BP up and integrating it with my own theme, buYt I’m having some problem installing the forums. At first I tried the ‘use existing install’ option (I do have an existing install), but had some problem, so I thought I’d start with a clean slate and try importing later. So I wiped out all of buddypress (plugin, options in wp-options, tables), reinstalled, activated and try to set up a forum with the ‘new bbpress install’ option. According to the wizard everything was set up, but no tables were created; the bb-config file was added, obviously forums were not working. I repeated the procedure twice, always the same result. I also made sure I had all of the previous bbpress and buddypress stuff removed from my WP install. To be extra safe I even increased to 64mb the PHP memory limit, but still no tables.
Do you have any suggestion?
Cheers,
Davide