Well, at this point I have neither the Viewsonics nor the Iso-Max installed. But what I have done is put a ground lift on the cable box and plugged it into a different power conditioner. So far, no hum.
I realized the TV and cable box were plugged into the same bank on my Furman SPR-20i. So the cable box is now plugged into the Furman Elite PF15i (which feeds the SPR). I've had this setup since Sunday afternoon. Oddly, the missing channels haven't come back yet; they were there with this setup before. I'll keep watch on it.
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