I encountered with a problem saying that headers were already sent while using slugs with mod_rewrite rules shown in bbpress FAQ.

And just to let people who was or will be up against this problem; i solved it changing the line 168 in bb-includes/pluggable.php

Change the line with this code line :

`?><script>location.href=”<?=$location?>”;

</script><?php`

[@_ck_ Participant 17 years, 5 months ago]

Someone will need to correct me if i am wrong but “Headers already sent” is sometimes an indication of whitespace above or below a plugin which will cause php to think content is being sent and flush the headers.