It wasn't a screen/system hiccup. I was coming over the top of the loop, maybe ~200-250mph IAS when I took a hit. The controls literally locked up on me, freezing my plane at the top of the maneuver. I know it wasn't the system because I was still moving forward, but the plane refused to maneuver. When I released the stick and resumed pressure again she finally started to respond (tho not in time to avoid the kill shot). This was in an F4U-1.
This wasn't the last time I saw this. A couple days later I was in a high-speed dive in an FM-2, I was pulling out and realizing the nose wasn't coming up QUIET fast enough and I was probably going to smack my belly into the ground. I took a(n undamaging) hit from field ack and the nose jerked up to roughly level flight, however once again I was getting no response from the controls (I was still at full back-stick at this time) until I momentarily backed off stick pressure.
Wish I'd have gotten these incidents on film, tho both were so brief I don't know if there would have been anything to see. Both times I CTRL-Ded because I thought I might have lost my elevators from the hit, which is how I know there was no actual damage.