I am curious what version you upgraded from. If you have been following each upgrade from 1.2.2 to 1.2.3 to 1.2.4 there should not have been an issue as those were minor changes to add new entities. If you like, send me your db and I can see what might be going on with it. Or, you have the option to delete the database file if your setup isn't complicated. I suspect that something happened with the schedule entry in one of the rulesets, even if you hadn't set one.