The keyboard indicator lights do not work on our systems (Caps Lock, Num Lock, etc.) The buttons themselves work, but not the lights. The lights work when plugging into a normal PC, so the problem does not appear to be with the keyboards.
We use the following configuration:
Graphics Client Plus nkload.bin version 4.10.23 smartio.bin version 4434-4017N Keyboard: Solid-Tek ACK-595 (http://www.solidyear.com/mini.htm)