How come my second tablet says disconnected and I have no Video but i can control the camera and vidio i perfect on my first controller.  My second controller wont let me go back to the page where you set the slave/ Master from the page where you program the C1 / C2 buttons,  there is no arrow back?  What am i missing?

How come my second tablet says disconnected and I have no Video but i can control the camera and vidio i perfect on my first controller.  My second controller wont let me go back to the page where you set the slave/ Master from the page where you program the C1 / C2 buttons,  there is no arrow back?  What am i missing?