This happened just once. This shape flicker (left side-right side of the picture) and only appeard if I were facing West (SW — NW).
Graphic setting at Very High
My PC: Windows 8.1
GTX 770
i5 - 4570
had something similar (flickering squares, same color) when I looked up into the sky.
dont know what the settings were at this point, try to find out more and maybe take a screenshot if necessary
i5 3470
RadeonHD 7770
8gb RAM
Win7
Yeah, we posted that at the same time, unfortunately (mine is one minute older I think 
).
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