I have a cell with a formula in it. When I try to add an IF statement to the
end of the formula, as soon as I type the "I" a dialog box pops up and says
"There is more than one cell with this label", and refers to the label "I".
The dialog box want me to choose which cell the labe lrefers to, but I have
no idea what it means. I don't have any cells labelled "I". If I cancel out
the dialog box, Excel then crashes.