Just checked mine, from the main screen there is the pull down menu, at the bottom of the pull down menu is a button for photo frame. Once in that menu hit setting, then scroll down and there is a night mode start time and night mode end time.
Not sure about his but mine does the same. Screensaver of rotating pic until around 11pm then the screen goes black until morning, then the screensaver comes back on.
I paired my PikTV remote to my shield and it seems to disconnect frequently and I have to restart the shield in order for it to work again. Also the buttons do not line up with the shield so a number of the buttons either open the wrong program(PikTV...