I got this one, and found nothing on the internet about it at all. So now I've figured it out I'm gonna post my solution. Got a VI that opens another and takes references to that others controls, and has a registered event created from that. IT seemed to work just fine, except the first time I would open it, after having closed all my VI's, each time. But when I ran it with the highlight execution it worked every time and I could never re-create the error in that mode. Turned out that afte