[_ck_]

One thing I see that changed in 0.9.0.5 is Sam put exit; after all the redirects.

In my experience I have found some weird behavior where redirects don’t happen in some cases because the exit will happen before headers are sent for the page. It shouldn’t put it does in some PHP versions/apache configurations. Probably because of buffering.

So as an experiment, maybe try editing the core file bb-login.php (not the template)

See this change:

https://trac.bbpress.org/changeset/1939/branches/0.9/bb-login.php?old=1888&old_path=branches%2F0.9%2Fbb-login.php

Put a comment in front of that exit;

bb_safe_redirect( $re );

// exit;

and see if that makes it act any differently.