为什么新Mac不显示我的屏幕保护程序？

We wrote an application, Screensaver Ninja, that installs an screensaver for the user by copying it to ~/Library/Screen Savers. This works fine in my machine and the other developer's machine but in a testing machine I have, the file is there, if I let the screensaver activate, it selects it, but it doesn't appear on the list:, tha