[colinbm]

Here’s a intermediate fix until whatever the causing reason is fixed:

http://www.burn-murdoch.com/colin/bbpress_fix_404.zip

Add this to the my-plugins folder (create the folder if neccessary) and activate the plugin in bb-admin.

All it does is call header(‘HTTP/1.1 200’) on the bb_init action, which overrides the 404.