BuddyPress.org

People let me say this clearly: BP DOES NOT CHANGE THE PERMALINK STRUCTURE OF ANY BLOG!

There is no instance of the global object $wp_rewrite in any bp code or any call to $wp_rewrite->set_permalink_structure()

Not in the member theme, not in the home theme and not in any bp plugin.

bp is not changing the permalink structure. The only thing bp does is hijack the word ‘blog’ and load the index.php template. That’s it.

@pietro28, what version of bp and wpmu are you using? Did you install wpmu in the directory mysite.com/blog ?