I am importing Excel data that has what seems to be blank cells but on closer
inspection I can see an apostrphe in the formula bar. That's not a problem
because I have written a macro to identify apostrophes and clear the contents
of these cells.
The mystery is that when the same data is imported on a friend's computer
with the same version of Excel the apostrophe does not appear in his formula
bar (although they are still non-blank cells) and so my macro will not work
on his computer since it doesn't see the apostrophes. Although I can write a
different macro in his case, I am interested to know what setting in Excel is
responsible for showing apostrophes in blank cells on some computers but not
others.

Thank you