Thanks Martin,
I use the function in a different sheet from where the data is, so I'm not
evaluating the cell where the function is, though I suspect it is something
related to your suggestion.

MMansilla

Hi Marcelo,

Off the top of my head I think it may be becasue the you put function in
say
cell B1 and it is checking B1 or in H1?.

Try put it on in a cell you are not checking.
--