Where exactly are you seeing this HD codec missing message, which website?
Next, the issue is resolved for one site by turning Java on and off again.
The "missing codec" prompt is still there, so that was unrelated to the grey overlay.
I get the "missing codec" at the top of that websites window too (www.movie2k.to) but have no issue with watching any of the videos there so I'd disregard that as the codec pack is for Windows 8/7/Vista/XP anyhow.
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