1) In current game (started before NFP, I am playing slowly) my city had a trade route to a Mongolian city (Cardiff). Eventually it ended, two trade posts were c4reated, as usual, but after then I was said there was no place to route from that city. Though Cardiff is still here, still Mongolian, also there are, in close vicinity, a city state, a couple more Mongolian cities, a couple of Persian cities and two cities of my own. I am not at war with anybody and WC din't ban trading with me.
I move the trader to my neighbour city and he easily made route to another Mongolian city (Tver).
Could NFP be not fully compatible with old saves? Or something?