That's exactly what appears to be happening.

I can copy the Xfinity hex codes into my Pronto and send them to the STB and they work....................but.............when I try to send them from the Pronto to my control system learner............the learning fails.

I've also been able to put the Xfinity remote into IR sending mode and the Pronto can learn them..........but......the same result.........when sent to the control system learner by the Pronto.........the learning fails.

Do u think learning them on the Global Cache IRL and then copy pasting to the Pronto and sending to the control system learner that way would work?

In other words, in this way, the XMP would be converted into something the control system learner would accept?

Or, can IrScrutinizer provide any solution?