Setting Traffic - Airport Life - Airport Vehicle Density from default 50 to 30 has solved this issue most of the time for me.
I wish I could still see at least a marshaller when I park. Since SU6, ATC has not once, ever, in more than 800 flights, in each aircraft I use, sent me to the arrival gate or other parking I selected in the World Map before the flight. So I ignore the stupid ATC designated gate or parking and instead taxi to the gate I selected. Do you ever select an arrival gate or other parking in the World Map and does ATC direct you there?