Hi,
finally the issue seem to be solved.
For who could be interested to know in case of same trouble, below the different steps I did:
. Reinstall SODE (Repair option): no effect
. SODE Unregister are register back: no effect
. SODE Deactivate and re-activate: no effect
. SIMCONNECT FSX Sp2: uninstall and reinstall: no effect
. SODE full uninstall and reinstall: no effect
. C++ 2005 redist reinstallation: no effect
. GSX reinstall (following actions suggested in another post): no effect
. SODE VDGS reinstall (Change option): SUCCESS! do not ask me why 🙂
KR