have you recently added the line sResourceDataDirsFinal=STRINGS\, TEXTURES\, MUSIC\, SOUND\, INTERFACE\, MESHES\, PROGRAMS\, MATERIALS\, LODSETTINGS\, VIS\, MISC\, SCRIPTS\, ShadersFx ? If so delete the last part shader(s)fx so it should look like this sResourceDataDirsFinal=STRINGS\, TEXTURES\, MUSIC\, SOUND\, INTERFACE\, MESHES\, PROGRAMS\, MATERIALS\, LODSETTINGS\, VIS\, MISC\, SCRIPTS\,Shader FX\ I had to completely remove Shader FX part due to it causing my game to start in windowed mode, along with it kept re-detecting my video card and settings and refused to load any of my mods. hope this helps you.