You can't re-crop an excel sheet to see a larger area once it's been placed on a draft sheet, so if you add a load of data it may not be visible.
This apparently is a Windows problem not SE.
You can get round it by having data in a cell way outside the required area. You will then be able to enlarge the cropped area at least as far as that cell.
bc.
2.4GHz Core2 Quad, 4GB RAM,
Quadro FX4600.
Where would we be without sat-nav?