This was an older bug in a previous version, but since then it was fixed, atleast on my game install. Might be something with the persistent files on your PC. Another user suggested this.
This happens when starting a new game for the first time. Doesn't happen on reboot
- Delete the persistent save files if they exist (in save folder on the game's location and in %appdata% roaming)
- Launch the game
- Start a new game and proceed until having the prompt
Try this and see if it works. If not, if I remember correctly, the bug was that you can't see the text, but you can interact with it. By that, I mean that you can press backspace a few times to erase the default name and then write the new name, it will work, you just can't see it in that window. If you press enter after the new name is written, it should be fine.
If this is still an issue, maybe try the discord server, you can get some help there probably. GL