DType your post 543
Well done you. When it comes to explaining what has gone wrong with a complex system that sort of post is very constructive.
I seem to remember a NASA lander that was lost just due to a metric/imperial error. Boeing are particular vulnerable to that sort of problem since they are outsourcing from an essentially imperial world to an essentially metric one.
The longer all the very clever people investigating the problem around the world come up with nothing wrong in their part of the overall system the more likely it is in the end to be something too obious to have been considered.