Hi, I have used the SetQualityLevel. http://docs.unity3d.com/ScriptReference/QualitySettings.SetQualityLevel.html The light is switching darker, when I change the Quality Levels. Here is a screen record from my project and from the bug. http://terberendezo.alexbutor.hu/Unity_quality_settings.mov I used WEBGL Debug Console to identify the problem and I got this error message: Try to reload assets from disk that is not stored on disk. Warning : changing antialiasing setting after startup is not support in WebGL. Any Idea why?