Excel blows up when selecting a formula

[CJS]

When trying to select a userdefined function Excel blows up.Even when I
try to expand the combobox it blows up. Has anyone had this problem
before?
Thanks,
Carl

 

[Earl Kiosterud]

CJS,

Excel, in certain situations, goes nuts with user-defined functions. But
you need to say more about where the UDF is called, and what it has to do
with a combo box. And what kind of combo box. What exactly does "select a
userdefined function" mean.