I am
always told to 'taxi to terminal', (before, and after 3.2.0), at every single airport, rather than any specific gate. When I arrive there are always plenty of suitable gates/parking spots empty (I have traffic set to about 33% usually), so I have no idea why this happens. I was hoping for a 'fix' at some stage... or maybe I have settings wrongly configured (though I don't think there
are any user settings for this).
The designating parking works, but with only 'one size fits all' (so far - Dave has said he will provide more options in a future update, e.g. for small, medium, large and cargo a/c), you have to explore the AFCAD and then change the designated gate for different sizes of aircraft before you fly, so I don't use it for more than a few airports. I taxi to the terminal and choose any of the empty spaces there.. not a big deal but not really what happens in the real world of course!
Martin