I had my own custom config which implemented some settings from the most recent config on this site, along with a few other configs and some of my own settings.
As of the latest update my config no longer works (no brightness increase, brighter red stain, removed fog).
I assume they have changed something within the engine.ini file, when someone finds out what line needs to be changed to be able to edit these settings once again, please post it here or as a release on the forums.
Thanks for your time.