This doesn't always occur but sporadically when looking towards the sun, even vaguely, so say 180 degrees of turning if your face is in the sun's direction, a large lighting artifact occurs. It's probably god rays related but it produces thick beams that cover the screen. These exist indoors too, and when the sun is high in the sky so not filtering through trees. Logging in and out does not fix this, it seems to occur/disappear on a server reset. Makes playing quite difficult.