I am still having the same problem. I am not using Genesis any more, I am now trying easynet, and their ethernet board, but it doesn't seem to matter what software I am using I can never seem to open the fastethernet.device
The latest advice I have been told is to install the medconfig program from elbox and see what it kicks out for clues. I have to download the program from somewhere else and burn it to a cd to take to my amiga... so it's a little of a pain but that is my next step.
I will be reading your post answers in the hope I can glean the answer for myself too.
Good luck!
Dan