Thank you for using the AutoCAD Support Forums. My name is Josue and I will be helping you with your request.
To assist you properly, please specify what is the operative system that you are using. For example, Windows 7 Pro 64 bits or MacOS.
You can check also if the most recent service pack for AutoCAD Civil 3D 2016 is installed, using the "about" command. In case that is not installed, you can download it from the following link.
AutoCAD Civil 3D 2016 Downloads
Best regards.
Josue Aguilar
Technical Support Specialist