I upgraded controller firmware to Ver 1.7.40 on both my radios. I was unable to get the slave radio to control the camera using the left and right joy sticks. Video feed was fine, I could control the camera via the slave radio using the iPad touching on the screen. Tried different settings with out any joy! Control sticks worked fine on the slave prior to the firmware upgrade. Master radio could control the camera as normal. Opted to downgrade the firmware to 1.6 on both radios, once both radios where re-booted I was able to control the camera via the slave control sticks again. I did not make any other changes to the app, the slave radio control stick simply operated again. Firmware Ver 1.7.40 possibly could have an issue.