Owesley,
How do you know that the VI completes execution? If you step into your VI (put a breakpoint on your LabVIEW step. Step into your VI. Click the Return to Caller button after your VI executes) If the Return to Caller button never appears, it means that there is a problem inside your VI and it is not correctly returning to TestStand.
If you have more questions or this doesn't help, please respond with the results of the above suggestion.
Regards,
Shannon R.
Applications Engineer
National Instruments