I also am having the same or similar problem with The Rifleman on Roku Channel. I'm S1 E12 and when I click on Episode 12 or any other episode either previous or after it moves to next screen saying "loading" like normal but once there, is a description of the next episode and photos of Chuck Conners etc., but there is no episode to click upon to watch just a beep from the remote if you click OK button.
I've been able to play through the previous Episodes but when I get to S1 E 12 and it comes up after 11, I get a blank screen once I click on play S1 E12.
I did find it on VUDU and all seasons, but you'll have to put up with a few commercials.
