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It now appears that the Soyuz rocket failure this week occurred because the Fregat upper stage had not been programmed for a launch from Vostochny.
Although the information is still preliminary, it is increasingly clear that all the hardware aboard the Fregat upper stage performed as planned. But, almost unbelievably, the flight control system on the Fregat did not have the correct settings for the mission originating from the new launch site in Vostochny, as apposed to routine launches from Baikonur and Plesetsk. As a result, as soon as Fregat and its cargo separated from the third stage of the launch vehicle, its flight control system began commanding a change of orientation of the stack to compensate for what the computer had perceived as a deviation from the correct attitude, which was considerable. As a result, when the Fregat began its first preprogrammed main engine firing, the vehicle was apparently still changing its attitude, which led to a maneuvering in a wrong direction. [emphasis mine]
This reminds me of the NASA’s epic failure with Mars Climate Orbiter in 1998, where some programming used the metric system and other programming used the English system, and no one noticed.