Hi Simone,
We unfortunately were unable to deliver a tutorial in time for the 3.0 release and indeed saw a drop in interest/support activity relating to Gantry not long after we put out that information.
At this moment in time, such a tutorial regrettably is not something I see being written in the immediate future and we definitely should have communicated this to you and other interested customers in a more timely fashion – please accept our apologies on that count.
That said, I’m interested in discovering what specific problems you are still facing here. Can you give me a current example (are the prevailing issues still exactly as described in this thread)? Just let me know and, perhaps, we can point you in the right direction 🙂