When switching from my macbook to my pc I cant map the gesture button to the control button and use the gesture button and move my cursor to the edge to switch to my pc. This is not an issue when moving from pc to the mac, it works just fine. When I hold down the control button on my mac's keyboard and move my cursor to the edge it switches to my pc no problem. There must be an issue when you map the control key to the gesture button on the mx master 3 it does not behave as it should.