More info in case anyone isn't bored by this yet.
Yesterday evening, I tuned in to the SM6 mux again, and it was showing the same Azteca 7 bug in upper right that had been shown in the G23 4.2.2 channel. So the SM6 channel seems to be a mixture of various things.
Then this morning, I tuned in, and as I mentioned earlier, sometimes this mux isn't 4 copies of the same thing. An example is:
You see the first 2 channels are one news program and the other two programs are another news program. I saw another example which seemed to be 3 or perhaps even 4 differing contents, but that's hard to prove unless I tune with 3 different receivers. But the above is definately at least 2 different channels.
THis morning, the 4.2.2 channel on G23 again had just infomercials again, then, around noon or shortly thereafter, it went again to programming with the "7" bug in upper right.
I know I seem obsessed with this, but I'm just trying to make sure that I find a version of that channel that was on IA6, and I'm still not sure any of these are the same.