Last night I noticed something. I wanted to see a recent version of Scorpion (the fort knox one) and when I searched for it it was NOT free. What I did was hit the blue "b" button, search for "scorpion" and when the results showed up, I scrolled up to "on demand". When I did that, the show was NOT offered as free, only "rent/buy"
BUT
if I hit the on demand button, tv shows->networks->A thru C->CBS->Scorpion
and the looked at the shows, this episode WAS free. No idea why it is free on one "on demand" screen and not another, but if anyone finds a show they think should be free, maybe this is your problem too