Won't let me load any of my saved games, traceback says all items have no attribute size. I've tried multiple rollbacks, but there's no change.
Viewing post in Sensei Overnight 0.5.0 Part Two Release! comments
The same thing has happened with other games, often when the devs have switched to a newer version of Ren'py. They sometimes knew about it and said that the old saves wouldn't work. Once, one game (My New Family by Killer7) required rolling back a few scenes to reset it, he warned us about it ahead of time. If this isn't happening with everyone, it's a little puzzling. If I have to start over again, well, I'll just get to enjoy the game again from the beginning. Not the first time it's happened. Thanks for your reply and your apology, even though I don't think that it's your fault. Best wishes and thanks for your work on a very entertaining game.
Rollback didn’t fix it for me, but hitting Ignore a few times did it.
(Thanks for the update Personas! Hope the break did what you needed.)
Tech details: the problem is that the UI state you were in when you saved is not compatible with the new code. Either advancing (ignore) or going back a few times until you hit a screen that is ok will fix it for most people.