We have made some significant changes to the Face Recognition engine in DualShield Biometrics Server 6.0. If you are an existing customer of DualShield Biometrics Server 5.x and using Face Recognition, then all of your users will have to re-enroll their FaceSense templates after upgrading to DualShield Biometrics Server 6.0.
Please install over the top of the old Server using this guide: Install DualShield Biometrics Server