[imp] advice please - my links or buttons to accept/decline event are missing from event invitations in imp.

[gimili]

I found this: 
http://lists.horde.org/archives/bugs/Week-of-Mon-20090126/042322.html 
and by making the changes suggested at least the links are now showing 
in imp.  The action drop down boxes don't show but at least it works. 
Hopefully I will stumble across what I have messed up in my install.


In imp/config/prefs.php
$_prefs['alternative_display'] = array(
      'value' => 'below',
      'locked' => false,
      'shared' => false,
      'type' => 'enum',
      'enum' => array('above'   => _("Above the message text"),
                      'below' => _("Below the message text"),
                      'none'   => _("Not at all")),
      'desc' => _("Where do you want to display links to alternative
formats of a message?"));


dans imp/config/mime_drivers.php
$mime_drivers['imp']['itip'] = array(
      'inline' => false,
      'handles' => array(
          'text/calendar', 'text/x-vcalendar'
      ),
      'icons' => array(
          'default' => 'itip.png'
      )
);