5: Cautionary key signatures - fragmented staves after removing

When using functions such as File > Append Score, Sibelius adds a cautionary key signature before the beginning of the next section if that section's key signature is different to that of the preceding one. If you then delete the cautionary key signature (or re-enter the new key signature, switching off Allow cautionary), you will find that a gap is left -- if you click in the gap you will see an invisible cautionary key signature. To remove the gap, select the bar where the gap appears and choose Layout > Reset Note Spacing.