I had a season pass for Sesame Street on channels 8 and 30 to record Sesame Street. It worked for a while, but now it doesn't. I've plenty of room, I've selected "first runs and reruns" and even re-set the season pass several times, but it no longer works.
When I manually tell it to record future programs, it says, "Do you want to record this episode also?" as if it knows it's supposed to.
Look in Recording History (first entry in the To Do list) to see why the episodes were not scheduled to record. One possibility is that the currently airing episodes were in your To Do or Now Playing lists in the last 28 days.
If this is the reason you can bypass the "28-day rule": select the option to "record all including duplicates".