I am tickled to have a brand new user choose to pop in with this much technical info re that line. Really I am. But it is curious. Dont' get me wrong, I wouldn't care a bit if you were the engineer in charge of product development. That would be awesome. In any case, welcome to the forum. Now if I may take advantage of your experience with VidaBox:
When you say "mine are running...", you mean Vidabox's thin (rack?) clients? Or do you mean some other box you put together that's working with it.
Extremely important to me is source direct video (and audio) output. I've asked them on a couple of occasions re source direct, what do you know along those lines? The sales folks said "interesting input" with my brief conversation re same. If you have any support channel or inside line, please let them know how much we'd like to see this. And/or let us know their plans (if any) in this area. If they want to move to the front of the pack, here's their chance.
What IS their particular mandatory video processing doing to the video stream. Or more importantly, what will it pass perfectly unaltered? Frame Rate, color space, video levels (PC or Video), scale, etc. Back when I was creating and authoring my popular calibration DVD, I found it was no simple task to get a PC to leave all that alone. At any point of the process, particularly playback. Very difficult, very easy to have wrong, and not much way to know it without special tools.