Umberto,
As I've said, I did ensure that the path in the FSX registry is correct, and it is and it was. Anyway, that doesn't explain the "expand before initializing" problem above.
Also, after I installed Dreamteam's KJFK, I can't use the GSX at any other airports... or I forgot how, i.e.: with ctrl+F12!? It says that there's no services in that area no matter what area I chose. Can you help there?
Thanks,
Lucio