P Smith, your logic does not follow. If I found a security hole in Windows 95 on one PC, and then later bought a new PC with Windows 98 on it that had the same security hole, while the hole did not exist on my Linux boxes, your logic would state that the problem must not be Windows itself. Rather, it is the common code between the two that makes the same security hole present on both Windows machines.
I am an expert troubleshooter. I can divide most problems up quickly and resolve them. In this case, we have a simple problem comprised of two parts. 1) Dish's code that interprets PSIP data (which I believe the be common between the DTVPal DVR and the Hopper, though I have no proof of this) and 2) A PSIP encoder that some ABC stations across the nation used a few years ago and some still use. Now, if you don't have a station with that PSIP encoder, then you won't see the problem. And if you don't use a Dish receiver with the firmware bug, you won't see the issue. That's how I'm easily able to fix the glitch - I just stop using a DTVPal or a Hopper for my OTA viewing and the problem is fixed. This is not ideal, though, as I don't want to switch back to DirecTV to fix a firmware bug, when I had nightmares with DirecTV's DVRs.
I disconnected my antenna from the Hopper, plugged it into the television and watched several minutes of artifact-free viewing on KAAL-TV. I then unplugged the antenna cable and put it back into the Hopper, and was easily able to detect the artifact problem. I also watched KAAL via Dish's HD LiL service, and the artifacts did not appear.
What makes this artifact so distinctive is both its regular timing, and it's appearance. When it impacts audio, it is the briefest of glitches - you might miss a syllable. But when it's in the video portion of the signal, it only appears in one tile. If you don't know what tiles are in MPEG2 encoding, then you probably don't know enough to troubleshoot this problem. It's there for a fraction of a second, and then it's gone. I much prefer the video artifacts to the audio ones, but I don't get to choose where this particular PSIP glitch occurs.