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I found one more interesting thing - I can't update my DirectX using DirectX WEB setup! It just shows an internal error! I even tried to reinstall...
In my opinion this problem hides some where in Hyper-threading! Taking closer look, you'll see, that there is a bug is preferences, when you are...
It looks like this problem appears only on Core i3/i5/i7 machines. Personally I got it on iMac 27" Core i7, Macbook Pro i5 and XServe Late 2009...