tassadar

Actually 4 questions:
1. When I kill the Shadow Dragon, the scroll for making Crom faeyr is not there (as it was in the original BG2). Any idea if it is a bug or is somewhere else?
2. Sime doesn't romance me. It is because i alrwady romance Aerie and can't have two romances?
3. The dungeon under Gate District has a funny-looking gate at the end of it. Is there a key for it?
4. Can't do the Harper/Jaheira quest. As soon as I bring Rybeck(?) to the Harper hold, the chap there disappear and I can't get in. Xzar appears and talk like I've already went for Montaron before *the bird quest) which is not the case. How do I start this quest?

Thx