If you haven't done son yet, set DEBUG to true in file 'config/config.php'. If it is an error message that is preventing the link from being drawn it will be printed.
Try this: Load OpenGoo and put this into your address bar and press ENTER:
javascript:og.openLink(og.getUrl('administration', 'index'))
If you see the Administration panel then you are administrator and for some reason the link is not being shown. If you get a permissions error then you are no longer an administrator. In this case, you can try creating a file called 'fix.php' with the following content in your installation's root dir and browsing to it:
<?php
chdir(dirname(__FILE__));
define("CONSOLE_MODE", true);
define('PUBLIC_FOLDER', 'public');
include "init.php";
try {
$gu = new GroupUser();
$gu->setGroupId(Group::CONST_ADMIN_GROUP_ID);
$gu->setUserId(1);
$gu->save();
} catch (Error $e) {
echo $e->getMessage();
}
echo "Done.";
?>