With the flicker when pressing 2 on the TiVo remote, what actually happens.

The TiVo OSD should come up and show 2 being selected and then blank the channel. Usually then the STB changes channel and when the blank screen is removed the new channel should be there, but usually the STB OSD is still visible. by now the TiVo banner should have changed to ABC and show the details of the current show.

Which parts of this work and what's different?

Peter.