I just upgraded one of our TV's with the Netbox 3. I have 2 others that are just TV + Digital converter, so nothing special.
However, one of those TV's just started speaking in closed caption (I think it's CC). We hear a voice telling us what's happening when none of the actors is speaking (John opens the door). Only happens on a few channels (channel 8 is one).
And yes, I checked our TV settings - CC is turned OFF.
Re: I'm Hearing Closed Captioning On A Few Channels
It's described video. It's suposed to be for visually impaired people.
You can check in the settings, by hitting settings, then Audio. There is a described video setting there.
Even though this is off, I have still randomly ran Into channels which have it turned on, likely at the source or Rogers end by accident (pushing out the secondary audio profile rather than the regular). Sometimes will disappear by a different show, or by the next day.