Hi GLM,
Please make sure you are running the latest version of all the software. Only X-Plane 10.51 will work with the latest Control Pad version. The X-Plane 10 Mobile app is not designed to work with Control Pad though.
If that is all up to date, you might try quitting Control Pad entirely and restarting it while X-Plane is running, or resetting all the networking entirely so that it is "refreshed."