Small Radios Big Televisions (390040) - Black screen with sound on startup

Compatibility Report

• Name of the game with compatibility issues: Small Radios Big Televisions
• Steam AppID of the game: 390040

System Information

• GPU: GTX 980ti
• Driver/LLVM version: nvidia 390
• Kernel version: 4.15.0-65-generic
• Link to full system information report as Gist:
• Proton version: 4.2.9
  steam-390040.log

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

Symptoms

When the game starts the screen is black, the sound starts and the cursor changes shape when you roll it across the screen but there are no graphics shown at all.

Reproduction

Start the game

steam-390040.log

Workaround iCCP didn't work

In the first time I ran the LOG file it came back with the following warning
iCCP: known incorrect sRGB profile
with:
pngcrush -n -q $( find . -type f -name "*.png" )
I could see that the png files in the game did have incorrect sRGB profiles
I fixed the files using the following from the directory
/Steam/steamapps/common/Small Radios Big Televisions/res/textures

mogrify $( find . -type f -name "*.png" )

Start with the attached steam-390040.log files and the reproduction details for Small Radios Big Televisions under Proton 4.2.9. Investigate the startup rendering failure while sound and cursor input continue; the issue is resolved when the game displays graphics normally on startup.