I had an issue lately. Got a new 722 (already had a 622) that I originally intended to hook up to a new Samsung Plasma. It worked with it just fine, did all I wanted it to do. However, I have it hooked up to a basic Sherwood stereo receiver. None of the codes worked with it. Tried the 622 remote. Would turn on/off the Plasma but that's all. (the code that was in the 722 manual would not input into the 622 remote) BUT, it worked perfectely with the Sherwood. So now, I have the new remote that came with the 722 working the 622 and vice versa. Weird.