there are many possibilities
a portion of the array may be text even if they look like numbers
there might be hidden cells whihc are being added even though they are not
being shown
the calc may be set to manual, not automatic.

many others

What type of problem are you having and could you put a copy of the equation
on the message



"Payton" wrote:

I have a Sum Array that is not summing correctly. What could cause this?