I wish I had that issue. I have an HD, an XD, and an old HD-XR all in the same room for development, and I can't for the life of me manage to block the IR signal from hitting all three. The HD will pick up the signal even if I point it outside of the room, with no obvious surface for it to bounce off of. It seems like some of the boxes were made with hyper-sensitive IR receivers.
My Channels: http://roku.permanence.com - Twitter: @TheEndlessDev
Instant Watch Browser (NetflixIWB), Aquarium Screensaver (AQUARIUM), MainSqueeze (MAINSQUEEZE), iTunes Podcasts (ITPC), Twitch.tv (TWITCHTV), My Channels (MYCHANNELS)