Incorrect playback of octave lines

I write classical piano music and often have many pages within the same 8va octave lines. Unfortunately, Sibelius only plays back the correct higher octave if the playback is begun from the 1st bar of the 8va. Starting from any subsequent bar under the 8va line, the notes are played incorrectly, an octve too low, i.e. they sound as if there were *no* 8va lines



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Idea No. 459