Hi,
I have a similar problem. I downloaded the full installer and installed it into my completely new P3D v3.2 installation. I also installed two updates in the past few days.
I tested it in Zurich (LSZH), Geneva (LSGG), Berlin (EDDT) and Barcelona (LEBL) so far (all default, with an AFCAD by Ray Smith). I used the Aerosoft A319, A320, A321 and the PMDG B737-800.
I tested on all airports at various gates (with jetway or out on the tarmac).
I usually have one or more vehicles missing. Sometimes a baggage cart is missing, sometimes the baggage truck, a couple of times i missed a catering truck or a baggage loader. When I restart couatl there is usually another vehicle missing
Operator where usually Dnata, Swissport or Air Berlin (EDDT).
I have also the problem, that it says boarding completed even if not all containers are loaded (with the aerosoft aircraft).