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VI only works if it is already open when TestStand calls it

I have a VI that is taking waveform input and saving the image to file.

It only seems to work when I step into it or if it's already open when TestStand runs it.

Any idea why this is?

CLA
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Message 1 of 3
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Not working as in "does not show the front panel"?

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Message 2 of 3
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It doesn't save the image.  

I made another VI that seems to work as expected, the only difference that I can see is that it doesn't have a teststand object reference input and it takes longer to run

CLA
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Message 3 of 3
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