@jamesdude11 Yes I do think it is the same issue and the answer is that the parking spots are too small. When I was at YPMQ i set up with a DH3, very small aircraft, then I used GSXpro to set me to a gate and I got the message saying there are no suitable size gates. YPMQ does have small parking spots, FStraffic does have routes in and out of YPMQ and does use DH3.
in my ticket, i said this and still waiting for a reply from them