If I access a TNT network program via Comcast's programming grid, the SNAFU normally begins after the first two commercial breaks. I have had a little luck then accessing the program via the TNT website, and watching the remainder through that. However, it doesn't always work. I am referring to streaming.
If I use the OnDemand feature via my cable box, which is hooked up to my computer, then I do not have a problem. However, the Comcast program listing grid does not provide as many "Watch On TV" choices as watching online.