[kronolith] URL with Kronolith is faulty

[Monica Messa]

When log in in kronolith, it redirects me to
http://server.com/horde//horde/kronolith/index.php.
Result:
The requested URL /horde//horde/kronolith/index.php was not found on this
server.
As you can see, there's one '/horde/' too much, but I can't find where...
In registry.php I have for kronolith (default, didn't change anything):

$this->applications['kronolith'] = array(
    'fileroot' => dirname(__FILE__) . '/../kronolith',
    'webroot' => $this->applications['horde']['webroot'] . '/kronolith',

At the very top, I have:

$this->applications['horde'] = array(
     'fileroot' => dirname(__FILE__) . '/..',
     'webroot' => '/horde',

It works for IMP and turba, so why not for kronolith?

Thanx

Monica M.