Re: wp-includes/pluggable.php on line 689
You should really triple check for blank lines or spaces or null characters at the start of your bb-config.php file. This part of the error:
output started at /var/www/virtual/mywebsite/forums/bb-config.php:1 points to that being the problem.
You should go into the start of the file and delete
<?php completely and press the delete key a few times at the start of the file. Then add
<php? back to the start of the file.
You didn’t upload your files using Dreamweaver did you? That program has an “option” to add a utf8 BOM character to the start of files, which causes similar behaviour.