I downloaded Embree 1.1, compiled it on linux using gcc 4.4.6. Everything seems to work but motion blur.
I read chunks of code and made sure I was using the bvh4mb flag and checked I had "motion" declared in my test xml file. One thing a bit unclear : the motion is goint to a dPdt variable, which means to me that I should just pass the motion vector, not a now position. I tried different things to no avail.
Moreover, when turning on motion blur, each iteration goes from 20ms to 15000ms, which seems a bit too much. I am wondering if I don't have a compilation problem here.