When doing a pre-flight test this morning, I noticed that the camera was not moving freely. Closer inspection revealed that the gymbal wires seemed to be fouling the back of the camera body. I pulled the offending wires back and away from the camera and that solved the problem immediately. I wondered what had pushed the wires forward and realized that the culprit was the gymbal protector which had pushed the wires as I installed it. So I will either check the wiring every time I fit the protector or just not use it at all.