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Eternity
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A shrewd poster (I think it was the operator of BeyondHalflife) had an e-mail in the thread up top commenting that this attachment revealed that Dr. Kleiner wasn't looking directly at you. An employee from Valve said that it was a visual bug. Yet, looking at a lot of these older screenshots, is this something that needs to be looked at in further detail? For example these guys have the same problem, and it isn't universal, as you can see from this screenshot which is just fine.