There are low power and high power USB devices. The Eye-One pro is a high power device. It will not work on self-powered Hubs (such as the Keyboard) because the USB port does not deliver enough power to drive the lamp of the Eye-One.
Solution: Plug it into a USB high-powered port such as the USB port of your PC or MAC or a Hub with power supply.
If connected to a Mac keyboard you may get an error such as "device drags too much current".