After a long uptime (5 hours of gameplay IGT), I discovered that the on_load event handler in 2.0.0 was screwed by doing things that only work in on_init, causing a crash on load without mod upgrade or other such that would trigger on_init. I lost the save because the on_init handler was using local variables that didn't get saved. I had to start my game over, but I did manage to patch it up by copying how bobclasses did global variables and on_init handler, made a new on_load handler function load_settings. I put it at https://pastebin.com/XfUigzak if you're interested.