Just realised my file had a reference to an external
object library. Looks like this was messing things up.
Thanks for helping me further!

-----Original Message-----
Only runs once for me.

--

HTH

Bob Phillips
... looking out across Poole Harbour to the Purbecks
(remove nothere from the email address if mailing direct)

"Claude" wrote in
message
...
Hi all

What is the logic behind the number of times a function
is
called? A simple example to illustrate:

Function add(a, b)
MsgBox ("add")
add = a + b
End Function

In the worksheet I have:
A1: 1
A2: 2
A3: =add(A1;A2)

If I change the value in cell A1, the function runs 3
times. Why? Is it possible to force a certain function
to
run only once?


.