When you select the items of a template and try to add a new item, no host is selected. I've debugged this and found, that the "Add item"-form has no host id set. Applying this patch helps, but I don't know, if the missing parameter is intended here. Could anyone please check this?

— class.chost.php.old 2009-12-10 13:56:23.613932688 +0100
+++ class.chost.php 2009-12-10 13:56:28.999914164 +0100
@@ -601,7 +601,7 @@
}

if(!empty($hostids))

• $result = self::get(array('hostids' => $hostids, 'extendoutput' => 1));
  + $result = self::get(array('hostids' => $hostids, 'extendoutput' => 1, 'templated_hosts' => 1));

return $result;
}