gistfile1.txt

/*
	These next two functions work together to lock down bbPress forums based on PMPro membership level.
	
	Check that the current user has access to this forum. Be sure to update the $restricted_forums array based on your needs.
*/
function pmpro_check_forum()
{
	global $current_user;
	
	/*
		This array denotes which forums require which membership level.
		The format is $restricted_forums[forum_id] = array(membership_id, membership_id, membership_id, etc)		
	*/	
	$restricted_forums[207] = array(1,2);
	
	//is this even a forum page at all?
	if(!bbp_is_forum_archive() && pmpro_bbp_is_forum())
	{		
		//now check this post
		foreach($restricted_forums as $forum_id => $membership_levels)
		{			
			if(pmpro_bbp_is_forum($forum_id))
			{				
				//we found the forum, now check the membership level
				if(pmpro_hasMembershipLevel($membership_levels))
					return true;
				else
				{
					//need to redirect away
					//wp_redirect("/forums/"); // not working headers already sent
					while(ob_get_level())ob_end_clean();
					//fix to yours url where to redirect to
					echo "<script type=\"text/javascript\">location.href='/membership-account/membership-levels'</script>";
                                        return false;
				}
			}
		}
	}
}
add_action("wp", "pmpro_check_forum");

/*
	Function to tell if the current forum, topic, or reply is a subpost of the forum_id passed.
	If no forum_id is passed, it will return true if it is any forum, topic, or reply.
*/
function pmpro_bbp_is_forum($forum_id = NULL)
{
	global $post;
		
	if(bbp_is_forum($post->ID))
	{		
		if($forum_id && $post->ID == $forum_id)
			return true;
		elseif(!$forum_id)
			return true;
		else
			return false;
	}
	elseif(bbp_is_topic($post->ID))
	{		
		if($forum_id && $post->post_parent == $forum_id)
			return true;
		elseif(!$forum_id)
			return true;
		else
			return false;
	}
	elseif(bbp_is_reply($post->ID))
	{		
		if($forum_id && in_array($forum_id, $post->ancestors))
			return true;
		elseif(!$forum_id)
			return true;
		else
			return false;
	}
	else
		return false;
}

i have added the contents of this file to the end of paid-memberships-pro/paid-memberships-pro.php