Just a quick follow-up on this... The sunrise pulse was the first action of the day, and was firing at 00:01. I read on some other forums about a previous issue with the internal calculation of sunrise, dawn, etc. if they were the first action. With this in mind, I created another dummy action at 00:00 and after that the sunrise pulse was executed at the correct time. This sounds like a bug in the internal calculation of these times so I will open a ticket with Loxone to let them know.