1. - yep, this is bugged, I have never got it to work either. Never got points.
2. - As described by Solypsist
3. - Yep, another bugged one, they always get the points no matter what.
4. - I think with this one points only get counted when the game ends (1453). Not positive on that one though. So if you build a fortress and it get razed, you have to build it up again.