Hi,
According to this link
http://support.tivo.com/app/answers/detail/a_id/348
the season pass should work like this:

If I have "Keep at Most" set to 5 and "Delete when space needed" set, then when it needs to record the 6th program it will delete the very oldest and record teh new program.

IT isn't working this way.
I ahve it set as "Keep at Most" = 25. It records 25 episodes tehn stops recording more.

Any suggestions?

Cheers