As I am making time signature changes in various places in a piece, the vertical spacing goes awry quite a lot as sections get pushed around. Then when I go back in to set the distance from the top again by hand, which I normally set to 20mm for the first system, some of the pages no longer show the measurement box and some do. Is this some sort of file corruption? What may cause this? The bad aspect of this is I can no longer enter an exact measurement on those pages where it is missing. Are we in bug territory?