Re: “Page not found” error
@grafics: It really seams that you have to chmod you .htaccess file to 777
@travishill: The most strange thing has happened.
i once again unchecked “Prefix your forum area with the Forum Base slug”
and the links started working
but at the same time the forums stopped using my custom templates and reverted to the templates from the child bbpress theme
I checked the checkbox back, and the links still work. But the templates did not revert to my custom templates 
I see that many people in this forum, who have this problem, eventually get it solved, but they cannot explain how 
Going fishing my template now…