Trouble watching some terrestrial TV shows

Using my Internet connection, I just signed up for 250 TV channels, some of which are on basic cable. I'm having trouble with some regular channels, such as on abc.com (ABC-TV, Channel 7 in NYC area). I can watch abcnews.com, but not regular abc.com. Does anyone else have similar issues? I'm typically getting an error code, or the show (audio and/or video) doesn't show up.

Also, I've noticed that several channels require an all-access subscription, which is typically $5.99 per month. Does my subscription cover these? Thanks.