Cable / Satellite HD reformatting ??

My Comcast HD STB only outputs 1080i to my new FP. No 720p on ABC or 480p on Fox. Anyone else notice? Solution?

I suspect that they are either saving bandwidth on the 720p by converting to 1080i and only sending 1/2 of the field (540) and letting the STB or TV fill in the second field. Or maybe they don’t want anyone complaining when the see the letter boxed 720 channels on their 1080 panels.

How about Dish / Direct satellite or AT&T U-verse ? Same issue ?