Today, Autodesk released an Update 2 for Civil 3D 2011. This update fixes several issues discovered by our customers (thank you all for your help) and our internal team. As always, please make sure you check readme file to get familiar with instructions for install as well as to familiarize yourself with what is being addressed in this update.
What is important to know is that this update applies to all language versions of AutoCAD Civil 3D 2011 and installation of AutoCAD Civil 3D 2011 Update 1 is required. One other thing is to make sure you are installing only version applicable to your version of installation (32-bit or 64-bit).