When my team tells me that their formula gives the wrong answer, I tell them
that they wrote their formula wrong, but this one...

I have a sumproduct formula that uses named ranges:
=SUMPRODUCT((hCountry=$B9)*(hIndustry=L$8)*hFees)

This formula returns zero, but the exact formula copied one cell to the left
returns the value 10. In fact, my sumproduct formulas from Columns A to K
calculate correctly - those to the right of column K return zero, and there
is nothing wrong with the formula (really...). It's as if Excel's memory can
only handle a certain number of cells

Any ideas?

thanks
Daniel