Re: Blank Screen
Sounds like you have a syntax error in the secret keys or cookie path that is creating trouble for bbPress creating the cookies. Line 188 of pluggable.php (in the 0.9.0.2 release, anyway) looks like this:
setcookie($bb->authcookie, $cookie, $expire, $bb->cookiepath, $bb->cookiedomain);
Can you post your bb-config.php with as little editing as possible? There’s probably something wrong in that file.
Alternatively, check bb-config.php with the php command:
[~pimpforum ] php -l bb-config.php
No syntax errors detected in bb-config.php
That’s an L, like php -L, but lowercase, in the command.