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Humm… What are your computer specs?
Sometimes when stuff like this happens it’s because a computer doesn’t have a fast enough CPU or enough RAM. Using Magic Bullet filter effects can be very demending on hardware because it’s (re-rendering) every pixel of every frame of your original footage to the desired film effect you’re after. The fact that you are mentioning "black" & "grey scale" might mean that your PC is choking.
Try going to Red Giant’s web page and see if you can find answers there.