One possible problem is that the key you are using isn't genuine and don't get me wrong with that. I think that it has been some years now that you can't obtain a key for IDEFIX so this fact raises the question about the validity of yours. Another guess would have to do with the upper/lower case letters. IN the past, while I was using a key that was tested to work before with IDEFIX, after a reinstallation of the Workbench/Software I encountered problems similar with yours. I wasn't respecting the lower/upper case letters and this was the problem. Check this out.
