Not one reply eh? Stumped you. Seems to be an issue with the switchable graphics.
I'm having the same issue specifically within particular apps (e.g. Chrome, MobaXterm). It's almost like any font that using anti-aliasing. Weird.
Windows 8.1 Pro Preview
Dell XPS 18
Intel HD Graphics 4000
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What driver you are using? The inbox driver? I have just checked and looks like Intel don't support Win 8.1 yet. Win 8.1 introduces WDDM 1.3.