[mrhoratio]

I’ve tried mod_rewrite, but running into problems with the wp_redirect functions in bbPress redirecting the page after the URL has been rewritten, so that the URL changes back to the longer form.

For example, this mod_rewrite rule:

RewriteRule ^profile/username forums/profile/username [L]

will rewrite:

http://www.example.com/profile/username

to:

http://www.example.com/forums/profile/username

Except, that after its been rewritten, bbPress forces a redirection, causing the URL in the browser window to change to the longer form.