Thanks! If missing prices are not the reason, then it's possibly some limit to the earliest week start. I'll inquire. - Update: I learned the weekend has indeed a 2 days 'core' from Friday 22:00 til Sunday 22:00. It can be made longer, but not shorter than those 2 days. And yes, this limit can be probably removed in a future version. Setting up the weekend is the user's responsibility, so there's no real reason for a limit.