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In this case, you should at least update the system requirements page ( http://unity3d.com/unity/system-requirements , System Requirements for...
It *could* have been, except AFAIK nowhere in the system requirements does it state to need an SSE2-capable CPU (or any specific kind of CPU to...
I believe I've tracked down the root cause, at least as of version 3.5.5f4 where it is still not fixed. In short, it is due to overzealous...