I'm using Excel 2002 with SP3. The problem is that the majority of links seem to work fine. Then suddenly I come across a number that is clearly wrong and when I check through, the cell to which it is linked has this completely different number. I have checked in the edit links box and all the sheets to which the Master is linked are set to automatic update. The Source spreadsheets are not open when I work on the Master and I always click 'Update' when opening the Master.