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What hardware platform are you on please?

And. has this ever worked or always been the case?
 
Could you please attach here your output log and settings file? They can be found in:

%USERPROFILE%\AppData\LocalLow\Iceflake Studios\Surviving the Aftermath\player.log
Documents\Paradox Interactive\Surviving the Aftermath\settings.ini

AND DXDIAG is a program you run from the Windows search box on the task bar. After running it will open a window and start collecting info with a progress bar in the lower-left corner. When it completes click the 'save all information' button and save it to a file then attach that file here.
 
System.UnauthorizedAccessException: Access to the path "C:\Users\User\Documents\Paradox Interactive\Surviving the Aftermath\settings.ini" is denied.
Almost certainly your antivirus app is getting in the way. Add Aftermath64.exe to all its exceptions lists, and prevent it doing realtime scans of the C:\Users\User\Documents\Paradox Interactive\Surviving the Aftermath\ folder.

All the best!