A small update which was affecting some players whose local language settings used decimal separators other than a full stop.
This would cause Gamma and Audio settings to go through the roof on startup.
If you get this issue head into the settings and lower the values to the suggested defaults:
Gamma = 0.2
Master Volume = 1
Music Volume = 0.9
SFX Volume = 0.9
Ambience Volume = 0.9
VO Volume = 0.9