Accidentals problem

In the screen shot it is not possible to annotate the note following the natural accidental with the accidental of the preceeding note but one. That is, in the first measure, the last eighth note cannot be annotated as sharp, in the second measure that last quarter note cannot be annotated as flat, and similarly in the 6/8 measure. However, these notes are, wrongly, played with the accidental of their prevoious note but one.

The work round is bizarre. Selecting the natural accidental in each case and pressing DELETE does not delete the natural accidental, but it does annotate the last note with the accidental of its previous note but one.