The only setting I didn't have set as you suggested was "AI Radio Communications (ATC), it was set to OFF. When I turned it on, I received my ATC clearance immediately even before I power on the aircraft. Otherwise, nothing else has changed. This only happens with the A310, ATC works correctly when flying the PMDG 737 and the Fly-By-Wire A320. Your A310 is really great but without ATC it is unusable for me, I will go back to flying those other airliners and hope you can fix this in the future.
Thank you for your quick response,
Sirraj