The command Extract Solid from Surface has a bug when you enter a value with a decimal value, where it doesn't accept either a comma sign (,) or a period sign (.) before the decimal value.  The workaround is to type the value you require in Notepad and then copy that text and paste it into the Extract Solid from Surface dialog box. Note that you can't use Ctrl+P to paste, you need to right-click in the box to Paste the value.

If you find signs in Naviate Traffic that are faulty, please check this library where newly updated signs are uploaded.  Updated Traffic Signs  After you have downloaded the sign/signs you require, place them in the appropriate sub-folder in the following path:  C:\users\public\documents\symetri\naviate\civil3d<version>\<language>\support\NVTraffic If you can't find the sign you are looking for in the updated library, please contact Symetri Support. 

When a Data Shortcut or an External Reference has been updated, there should be a notification bubble pop up on your screen at the bottom left.  This bubbles behaviour is controlled by the command TRAYSETTINGS, so if it doesn't show up (or if you want to change the behaviour of it) start looking at the settings in TRAYSETTINGS.  But if the bubble still doesn't show up, and you have two or more screens, that might be an issue for you.

We recommend to always have the correct Country Kit installed on your Civil 3D. Country Kits are supplied for Sweden, Norway, Denmark and United Kingdom & Ireland (among others) These country kits are supplied free of charge from Autodesks Download portal that can be found here: https://knowledge.autodesk.com/support/civil-3d/downloads Find the country you require and the correct version of your product and follow the instructions on the page to complete your installation.