Civil 3D Defaulting to Wrong Profile on Launch

When opening Civil 3D the app will open to the default account rather than the users account (removing customized displays etc.). 

FIX:

1. Duplicate the standard Civil 3D metric/imperial start shortcut
2. Right-mouse-click the duplicated standard Civil 3D metric/imperial start shortcut link, and open the properties.
3. Edit the target: "C:\Program Files\Autodesk\AutoCAD 20xx\acad.exe" /ld "C:\Program Files\Autodesk\AutoCAD 20xx\AecBase.dbx" /p "<<C3D_Metric>>" /product C3D /language en-en":     
   • Change "<<C3D_Metric>>" to the profile name that should be loaded as the default profile

Note:

    The user's Autodesk username is not the same as the Civil 3D profile name. To find the Civil 3D profile name, navigate to: "C:\Users\<user>\AppData\Roaming\Autodesk\C3D 20xx\enu\Support\Profiles"

Link:

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/How-to-start-Civil-3D-with-a-default-custom-profile.html