How far away from the cameras is that wall? That disparity image looks pretty good and at least proportionally to each other the obstacle avoidance bins look right (middle and left are about the same, a closer one on the right where it saw those dots of light on the wall). We are aware that the 3d reprojection is often better around the distance that the calibration cards are when the extrinsics are calibrated, and are trying to work out a solution to make the reprojection more reliable at farther distances.
Seemed like a weird fluke... I reinstalled the system image + voxl suite this time from the install script, then removed the packages individually and reinstalled my built versions, and it worked...