I haven't looked clearly at this, but I (sort of) agree with the majority. I think 4D-1 is a strange ruling - either let it stand (saying the UI said "I don't know what to do") or adjust to 5D-2 (I can't see North passing short of game in a strong IMP game - here we're ruling that "the UI shows hearts").
But I'm not an true expert player - the poll of true experts will show me what to do. Maybe they would play a partscore.
Michael.

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