Is there some reason a map reduce script scheduled to run daily every 15 minutes with no end date stops re-scheduling itself after midnight? I notice that even though I have not checked Single Event, when I save it, it has a cross beside it in view mode.

I just figured it out! I was about to say when you replied. I almost always trigger these by script so I didn't know. It has to be set to 12:00am start for it to recur, thank you.