After poking around my speak for bend points, I've come to find that there is now a column of buttons that not only do not work, they actually cause the VFD to cut out, and if I hold them long enough, crash the entire thing. I'm bending a Rev. J model, and it seems to me as if the membrane keypad is grounding out somewhere, but I don't know where. Also, all of the surrounding keys, save those directly above and below, work but don't update the VFD. Any possibilities on what it could be?