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calling LV 6i from Visual C++

I'm trying to call Labview from a MS Visual C application via Active X.
I've
downloaded the sample code from NI (Calling Labview) and it works (with
minor mod.
for LV 6i).

However, when I make my own VI and try to call it the same way, I get an
exception as soon as the C application executes the 'call' statement.

I cant see any fundemental difference between the VI in the sample code
and the one I've written. Is there some setting I'm missing (I've checked
the Active X server box) ?

Chris Timossi
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