Minibox Remote Problem

I went through the minibox activation process without any issues. I hooked the minibox up to a fairly new Samsung TV and went through all the steps. Everything was straightforward and simple. Then I tried to sync the new remote up to the TV and that's where I've had problems. I had no trouble finding the right Samsung code and the remote behaved just as the instructions said it should. (I tried all of the Samsung codes.) But that's where everything stopped. The new remote will turn the TV on, I can adjust the volume and I can mute, but that's it. When the TV is hooked up to the minibox it's stuck on the same channel it was on when I began the process. I can't change channels with the arrows or by entering the channel number. I can't access the COX channel, Guide or Info. with the new remote. But when I detach the minibox and go back to a direct cable connection to the TV everything works as it did before. I don't know if the new remote is defective or if there is a more complicated issue. I have retried activation 3 times and the results is always the same.