Huge Bug???

[LordNemesis]

I just installed Throne of Bhaal on my computer, and I was in the Underdark, and I noticed that I couldn't talk to a lot of NPCs running around in Ust' Naka or whatever that drow city is called. Every time i tried to talk to someone, the message "You cannot talk to this person, they appear to be busy" or something like that came up. Even when i tried to talk to soulafein or the important NPCs, I was unable to do so, so thus I am unable to progress in this game. Anybody have any ideas as to why this is happening?

Thank you.

[Bloodstalker]

Have you installed the latest patch? this seems to be a common problem.

[Nightmare]

This is corrected in the main patch.