Ofacet, you didn't tell us what the solution was. It might help others with the same problem.
The crew (or TDC) does calculate the speed and course once you have taken a range reading twice with some time inbetween, and sent it to the TDC with that special button. After this calculation the target speed dial is set to the nearest value, but isn't sent to the TDC yet to take it into account. This button must be pressed again to make it stick in the TDC.
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