This post will assist you if you are having problems with Trackmania Nations Forever / United Forever, such as white screen issues, graphical glitches, or launching issues.
Follow these steps to fix them, these steps fixed all of my game-related issues.
Fix 1: Modify Nadeo.ini and Install required patch
Modify the Nadeo.ini configuration file.
C:\Program Files\(x86)\Steam\steamapps\common\TrackMania Nations Forever\Nadeo.ini
Look for a row that says “Distro=XXXXXXXXXXXXXXXXXXXXXXXXXXX“. Remove all after “Distro=” and replace it with “Distro=MILIN.”
The file should be saved and closed after that.
Download the latest version of the software. (Although it is named “United Forever,” don’t worry; it also compatible with TM Nations)
Install the executable that you downloaded and save it to your default Trackmania Nations Forever folder, such as this:
C:\Program Files\(x86)\Steam\steamapps\common\TrackMania Nations Forever
Everything is ready to go once the installation is completed. There will be no more White screen, Launching problems, and Graphical Bugs. TrackMania Nations Forever should now function properly.