HD1024 schedule not starting presentation

Hello! We got an HD1024 player, and I have set up a presentation to play from 8am to 7pm. The schedule is correct, the internal clock is correct! And the player does stop at 7pm, no problem. It just that it won't start at 8am. Why? I was sitting next to it, checking the clock on the diagnostic page, and it won't start. I have re-publish the schedule for it to check the time and realize that it supposed to start. We are using local networking, firmware is 8.5.36.