FWIW I've just done an upgrade from 4.1.10 to 4.2.1 and the plugin is still working fine for me!
My settings are:
LDAP Server
dcname.domain.com
LDAP Port
389
Anonymous Bind
No
Bind DN
CN=Account Name,CN=Users,DC=domain,DC=com
Bind Password
<password for above account>
Naming Attribute
sAMAccountName
Search Base DN
DC=domain,DC=com (see my
earlier post in this thread about searching sub-OU's)
LDAP Attributes
fullName,mail,sAMAccountName,displayname,title,l