I'm still seeing this in the Austin, TX area (KTBC Fox7) on my Vizio VP42 tuner. It is almost as if the framerate is lower (15-20 fps). When I tried it on my Hauppage HTPC tuner and my Dish Network DTVPal DVR (HD) I don't see the effect.
I'm only using OTA, so I wonder if the Vizio tuner has some components in common with the cable boxes everyone here is mentioning.
Noticed the same thing at my brother's place with his TWC HD DVR (don't remember model). Clear QAM straight to his Sony TV was fine.
Almost sounds like an excuse for me to upgrade my TV or watch less sports