Also, have you confirmed that the DirecTV receiver is not in "RF" mode. Sometimes at bandcamp....LOL I mean sometimes after a firmware update, direcTV has reset receivers back to RF mode by default which would cause an issue like this.
You can check by pressing menu/parental and favorites/setup/remote/"IR/RF" and making sure it's set to IR from the actual DirecTV remote......
So, although I had said several times to my wife & her roommate to make sure the IR receivers were set up and everything was working properly, and they said everything was plugged in and working. Today, when I showed them the articles you linked to...they said "Oh, those things are supposed to be ON the box?" and now it works. Unbelievable.
Thanks anyways, guys!