Dark shadow wherever I walk?

[Ark5]

there are like a texture glitch wherever I walk, where it's all darkness. I couldn't find a topic about this. please help me and tell me how to fix this annoying darkness wherever I walk

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[Ipquarx]

Try turning up your graphics?

[Lugnut]

pictures

also

CONSOLE.LOG

[Greek2me]

This happens on somebody I know's computer. Try typing this in console:

Code: [Select]

flushTextureCache(); resetLighting();