Hmm, the OIS problem is the camera starts trying to stabilize a pan, but once it gets to the end of it’s range, it jumps back to the center, creating what looks like a jerky pan, so I don’t think that’s what’s going on here. Without genlock, two cameras will run out of phase and at slightly different speeds making it impossible to smoothly cut from one to the other. I don’t know how your switcher is dealing with it, but if it buffers the inputs and re-syncs them with a delay, you might be seeing what happens when they drift too far and need to re-sync. Not sure, but just a thought. Anyone else???