i just downloaded and installed bbpress. everything worked fine. i have the most recent release of wordpress installed in my main site directory and bbpress is installed in the /forums/ directory.
when i go to http://www.mysite.com/forums/ it displays the main page, but with no images/styles. when i try to view my css file in the browser (http://www.mysite.com/forums/bb-templates/kakumei/style.css) it displays my main wordpress page.
i have pretty permalinks running on both and would like to keep it that way.