Did she also set the resolution on the 722k to 480i?
We have a 222k. The installer (although really good) tried hooking the box up to the TV via component cable, but it had a double image and would not work due to the resolution being set on 480p (the default). He then tried to use the AV cables, but I noticed the sound quality was not great although the picture was not horrible. However, I told him to wait before pushing the furniture back, and I wanted to try changing the resolution to 480i. Sure enough the box worked via component cable. The picture and sound are really great.

The only thing is some of the HD channels that do not show HD content; that is why we locked out any HD channels that have SD duplicates. Otherwise, we have the HD only channels in the list like Palladia, HD Theater, etc. Channels like Centric and Logo never seem to show real HD content; so, it looks scrunched in the middle. However, you can temporarily use the format options so it fills up the screen. The thing to remember is to change it back to normal when done viewing the channels. We just never change the format and just let it be so no one forgets to change it back. Right now I am the only one in the family that seems to get all the options for the box and remote.