Standby doesn't work

My Apple TV doesn’t go to sleep. Neither by using the menu nor the remote-command. The light is on all the time and it always display the menu, when I click on Standby in the menu nothing happens. What did I do wrong? Standby worked before installing aTV Flash.

Do you have Overflow installed? If so, please ensure the ‘Settings’ menu is enabled in its default location.
http://wiki.atvflash.com/index.php?title=Overflow

Thx, that solved the problem. Great support!