I have no experience yet, only interest (in getting them working ;), but I have a couple of questions:
(1) How are you powering the board--AC adapter or power-over-ethernet? (I'm not sure POE works, would be great to know.)
(2) What sort of adapter are you using (i.e. did you have to manually set the pins) and is it fully and properly connected (physically)?
(3) Does the board need to be set into a particular "flash" mode, as some of the other routers, perhaps by pressing/holding a reset button?
Cheers,
Matt