Version 1.2e works great on MediaWiki 1.19
Just dropping by to say version 1.2e works great on my system --> Ubuntu Server 12.04 LTS, MediaWiki 1.19, PHP 5.3.10, MySQL 5.1.62, Apache 2.2.22, Microsoft Active Directory 2003
This is what I have in my LocalSettings.php
require_once( "$IP/extensions/LdapAuthentication/LdapAuthentication.php" );
$wgAuth = new LdapAuthenticationPlugin();
$wgLDAPDomainNames = array("mydomain.com");
$wgLDAPServerNames = array("mydomain.com"=>"work.mydomain.com");
$wgLDAPUseLocal = false;
$wgLDAPEncryptionType = array("mydomain.com"=>"ssl","mydomain.com"=>"tls");
$wgLDAPSearchStrings = array("mydomain.com"=>"work\\USER-NAME");
$wgLDAPDisableAutoCreate = array("mydomain.com"=>false);
#LDAPDebug will show debug info
# 0 (default) = disabled (best for production systems)
# 1 = Will display non-sensitive info
# 2 = Will display possibly sensitive info
# 3 = Will display sensitive system info
$wgLDAPDebug = 0;