Hi Umberto,
I got back into MSFS today and tried using FSDT GSX Pro again. After opening up the additional services in the GSX menu to change the cargo specs and once changed I closed this operation. When I opened up the GSX menu again I got the prompt "Loading GSX menu, please wait". I waited a period of time but the GSX menu did not open. I have attached the Couati file for your information to see if you can identity the problem. Thanks.