Found the post I was thinking of (on the WordPress.org forums). I replied with some questions and never got a response. Don’t know if that means the user found the problem or gave up. So … Try adding one game (using Add Games) to your chosen league and season. What happens? Then try creating a new league (and seaon) and adding a game to it. (Because your chose league/season may be janky.) What happens?
If your debug log is active, check and see what’s in there. If not, activate WordPress debug (see Debugging in WordPress), repeat the above actions, and see if anything is in the log.
Let me know.
-Mark