well, that didn't work, but it did shed some light on the problem... everytime I turned power off and on to that USD hub port, in DCS the notification in upper right said HID unplugged, or plugged (as I would expect), but it also said TrackIR unplugged/plugged.
Seems like DCS is thinking my F18 brain is my TrackIR. I don't know how to fix that yet, but at least I'm on to something.
So I don't think I need to reflash my brain board, at least not yet.
Thanks for your help!