Did you turn on the "Allow Network Control" function on the Tivo your having a problem with?
If not go to Settings>Remote, Cablecard & Devices>Network Remote Control>Allow Network based remote controls.
I had the same problem till I did this, now all is good.
If not go to Settings>Remote, Cablecard & Devices>Network Remote Control>Allow Network based remote controls.
I had the same problem till I did this, now all is good.