Playoff roster problem - but not the usual one
 

I'm using a custom schedule of mine (32-team, 166-game), and there was some bizarre error where the playoffs were set to start in April of the following year. Also, the final series of the regular season got cut off from the schedule for most of the teams. So I used the schedule editor, league events list editor, and custom playoffs to fix all that nonsense. But now the playoff roster rule is not in effect, and when I go to the "playoff roster" section of my team's roster menu (we are in the playoffs) it says "the league is not in playoff mode," and I can't find anywhere I can turn playoff mode on. Anybody know where I can do that, or how to otherwise fix the situation? I'd rather not have to release/waive any of the out-of-options players that I don't plan on putting on my playoff roster just yet.