MCE And Comcast RNG110 STB, Can't Change Channels

I am trying to set up a Set Top Box connection in Windows Media Center on W7x64, but I can't get the Windows Media Center remote to change the channels in the setup. I have the USB IR transceiver with an IR blaster in front of the STB's IR receiver, and when going through the setup WMC states it has the remote code correct, but it doesn't work. I have fiddled with every conceivable setting, from manually coding the STB's remote to picking out all of the possible code's from a list, but it doesn't work. I have also tried all of the immediate settings (number of channel digits, pressing enter or not), and it's still a no go. From what I've read, other people have had issues with this particular STB. It seems that most people's answer was just to trade it in, but I don't think that is an option at this point since Comcast has been using this box for over a year now.

Also, I thought I should mention that the USB IR transceiver does indeed pick up the STB's signals, as it flashes when I use it. Maybe an IR to IR cable from the back of the STB to the USB IRt would work?