I've got a problem with the third duty as a member of the Order of the Most Radiant Heart. I was suppose to guard a girl until her uncle returned from Baldur's Gate. Rumours had past that she was to be killed, and I slaughtered the assasins who came after her... She was upstairs safe and sound, but the uncle never showed up! I've been waiting for two days now, and if he doesn't show up, I'm gonna kill that girl myself!
What should I do? Is it an error in the game, or did I do something wrong?! :confused:

I think you have to go upstairs and talk to her then wait downstairs.

You musn't rest or anything, just wait, have people blocking the stairs, archer would be good.

you may have to start it again from autosave or something.

When the uncle comes use detect evil. Just a hint.

There are two bugs with "cutscenes" there. Retry as 8people suggested, if it doesn't help, install SPfixpack from:
http://www.sorcerers.net/Games/BG2/index_editors3.htm