I've got an answer to everyone's woes...it seems the CIFS configuration plays a part in the Active Directory integration. I was having similar issues, all resolved when i went into the CIFS and changed my workgroup to the NT4 domain name (e.g. If your domain name is contoso.net, workgroup is CONTOSO)
Resolved my issues and all is good in the world!
Resolved my issues and all is good in the world!