From what I have seen along these lines, the expected behavior when LabVIEW is closed is for the GPIB handles to be dropped and REN line goes low (causing your machine to go into local mode). The only exception that I have seen is when you leave a session open before closing your application. Another work-around I saw discussed in another forum post, would be to physically tie the REN line of the bus to ground so that the device is always in Remote Control. If you never want to have the power supply controlled from it's own front panel, this may be your best option. Hope this helps!