Another curiosity just noticed:
On the Wright Patterson HD2 channel on G17, which is "scrambled" but actually visible, the "scrambled program" screen doesn't disappear. I note this because on other channels that are flagged as scrambled but ITC, the screen does disappear. I noticed this on another channel recently too, but I don't remember which one.
Not a huge deal as it does seem to get out of the way on the "scrambled" channels that carry interesting programming, but something I thought I would note for you.
Maybe there is a difference in the way it sets the scrambling flag, the scrambling mode it's in or the scrambling system?