There are a few games that seem to have a bug that prevent them from using default audio device. I use a TV via hdmi (Intel display audio). Usually works perfectly. Ion Fury is the second game where I can't hear anything and the first game that crashes after a few seconds of gameplay. Log file says 4000 times: "S_StopEnvSound(): bad voice -2 for sound ID 521 index 0!" Really annoying.

I have the exact same issue. When I run the game in software mode, I get sound but no gfx output.

The only thing that seems to work is a lower resolution in an actual Window. Even borderless mode breaks the sound again.

I have no idea how to solve this.

Seems to work now. Don't know why. Windows update?