I fixed the online.php. Your install instructions is missing some vital code. All pages require 2 entries in online.php: [where] and [activity].
Your's is missing the [where] function:
Code:
case 'vbstory':
$userinfo[where] = "Reading an Interactive <a href='vbstory.php?s=$session[sessionhash]'>Story</a>";
break;
Added it for John's arcade hack and the toplist hack and it works nicely.