I think I have figured out your problem with the 404 errors. This looks like a bug with changes made for spider friendly.
I'm guessing if you look in your error logs you will see
http://www.astelbania.com/cgi-bin/ultimatebb.cgi&r=npwm which will generate a file not found error. To fix this, change line 689 of the ultimatebb.php from
$location = figurelocation();
to
$location = figurelocation(1);
