Lighttpd clean URLs problem

I added the rewrite rules for Lighttpd to enable Clean URLs as described here: http://drupal.org/node/43782

After enabling clean URLs phpbbforum stopped working, showing in a frame resulted in an infinite site within site within site etc and a "no forums defined" message

Showing 'in the page' displayed the forum ok, all links resulted in a 404 not found tho.

I switched clean URLs off again and the problem still persisted, I had to remove the rewrite rule from Lighttpd's config file before phpbbforum started working again.

so just a word of warning, module is incompatible with Lighttpd with clean URLs for some reason.