I upgraded an older HR21 to a HR24-500. The HD channels are fine on the HR24 but the SD channel deinterlacing is horrible. I've never seen so many "Jaggies" on my TV. I also have a HR23-700 that does not have this problem with SD content. Changing to Native Mode does not make a difference. The only change that makes a difference is to use letter box. Using letter box is not needed on the other receivers. I did a quick search on the forum but could not find any postings about this. Is anyone else having this issue with the HR24 or do I have a bad receiver?