It can't be a dead pixel, you can't screenshot a screen defect, and that looks like a screenshot to me.
so , you have a dead pixel that simply cannot render a specific color (white/red/blue/green) and Metro, simply just had to actually put a white pixel right there ...
man, you made my day .... my cam (sony w200 has the same issue ... it has some dead pixels and in black it shows red, but in all other colors work fine) .. damn you science
Man, you made my day....../s
My guess would be some type of GPU rendering issue, whether thats because of Windows 8, drivers or GPU fault, unknown
at this point.
Seems rather specific for a GPU fault though, those generally show more signs, other artifacts in other places, random colours, etc.
Maybe it's a secret link on Neowin put there by the Illuminati, the true masterminds behind Metro, part of their master plan at dumbing
down the world so they're easier to control.