When starting a new game:When you start a new game, all works fine. I didn't spot any bugs.
When converting from native to 2.01:When you convert a Native savegame to the Expanded Mod Pack, I noticed that the kingdom names are a little shifted in order, and in 'Notes' the images of the npc's are also wrong (although it will be corrected when you actually click on the npc). I haven't been able to find the cause of this, but after some playing I noticed that it doesn't break your game.
When converting from 1.0 to 2.01:- When you convert from 1.0 to the next version, you've got the above problem, and an additional one with the troop trees that might be a hindrance. Some better tier units get a much lower level than they should have. And when I start a new game, they do have their right level. I guess it's because of the transition from one complex troop tree to another. The only thing I could do about it is making sure that similar units have the same position in the troops.txt, which I did. Despite that this hindrance occurs. I have found no way to fix that

.
- I also noticed that, when converting from 1.0 to the next version, I had to rehire my Diplomacy staff, who thereafter seemed to work fine. 60 denars is a small price to pay.