"user-agent": "Mozilla/5.0 (%osinfo) AppleWebKit/%webkit_ver (KHTML, like Gecko, Chrome, Safari) NWjs/%nwver",
"chromium-args": "--enable-node-worker --disable-plugins --disable-internal-flash --disable-popup-blocking --allow-file-access-from-files --ignore-gpu-blacklist --in-process-GPU"
}
Looks alright to me. The "--enable-node-worker" arg is exclusive to C3 and needed if you run your game in worker mode. NWjs worker mode did make problems in the past, it could be in conflict with "--in-process-gpu" but it's difficult to tell. If you don't use worker mode, I'd recommend removing "--enable-node-worker" and try to reproduce again. At least this way we could try to isolate the underlying cause.
When you say you get reports of it not launching or running the in the background. Do you mean on Windows or other operating systems?