This is one of the reasons that even though I watch the Yen futures, I rarely trade them. If you do a look back through daily charts, you can see numerous times when the Yen had huge daily moves that you could get whacked on if on the wrong side. I prefer the Euro as it's more diversified in my view in that there are several countries involved and less opportunity for a good stop hunting shellacking. I thought perhaps it was a bad tick, but CME is also reporting the move in their delayed data.