[@robin-w Moderator 12 years, 6 months ago]

I suspect this is not related, but always worth checking

Do you have a forums page with shortcode.

If not another poster did the following with success for a twentyfourteen theme.

So let me restate what you found to work:

1. When creating a menu item for forums, do NOT use the automatically available permalink that ends in “/forums/”
2. Instead, create a page that has the shortcode [bbp-forum-index] in the body. There could also then be other content or links in the body.
3. Make sure the page you created does NOT have a permalink that ends in “/forums/”. In my case I had a page Title of “Forums”, but I changed the permalink to end with “/allforums/”.

I suspect that this will not fix for you, but give it a try anyway !