[Trent Adams]

From the FAQ:

Create a file called .htaccess in bbPress’ root directory. Put only the following line in that new file.

Options +MultiViews

Just upload a file like htaccess.txt with the line mentioned above and then use the FTP program to name it to .htaccess versus htaccess.txt (notice the dot before name).

WordPress is just thinking right now that you have a URL that doesn’t have an assigned page or post to it and it is getting screwed up! Try that one out!

Trent