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.

--
Earl Kiosterud
mvpearl omitthisword at verizon period net
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"CJS" wrote in message
oups.com...
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