An update -- I have some LabVIEW code that sends a DIO true/false value depending on a button press, recieved by the Arduino on a digital pin, and blinks the light on the Arduino and also prints out the high/low value (simple test), slowed down to 1/2 second cycle. Currently I'm getting a semi-random highs/lows, even without pressing the button, which I'm guessing is LV's issue, not continually sending the true/false signal? Unfortunately, I lost my LV computer so I can't check it -- maybe I can schedule for a 3 am session?
