At random times when I enter the Hunter GMG/HMG, the screen inside the cab that is used to view the feed from the mounted gun is not displayed at all other than a red crosshair. Haven't been able to find a way to replicate repeatedly nor fix. I have tried getting in/out of the Hunter, changing views, toggling nightvision, etc.
I have a video example as well, it happens right at the 2:40 mark: