Delete Prefs.ini
In this location:
\Documents\My Games\GC3Crusade
Delete the prefs.ini file and try to run the game again (a new one will be created).
Low Prefs
For clients with low-end video cards (especially Intel PC's with only integrated Video), try running the game with some lower base settings to see if that resolves some of your issues.
Please download the following Prefs.ini file and unzip it in the location following:
http://sd.stardock.com/Support/games/GC3/LowSettings/Prefs.zip
Directory:
C:\Users\YOUR_USERNAME\Documents\My Games\GalCiv3
Gameplay Settings: http://screencast.com/t/0fY8D8OK
Galaxy Settings: http://screencast.com/t/bY1JfuDbK
Try experimenting with these settings pointed out: http://screencast.com/t/pUNAl62jVs
Black Screen issue
If you're running the game at fullscreen, or a non-native resolution, please change the resolution to the screen's native resolution or run in windowed mode.
If the above does not fix the issue, they the following steps:
In File Explorer, go to \Documents\My Games\GalCiv3
Edit the Prefs.ini file, look for “Api=X” set this to “Api=dx11”
Missing text in game UI
Go to this folder (you might need to make hidden files and folders visible in order to see it).
C:\ProgramData\Stardock\Galactic Civilizations III
C:\ProgramData\Stardock\Galactic Civilizations III - Retribution
And delete these files in it
K2FontData_Small.fontdata
K2FontTexture_Small.dds"
Try to run the game again.