I've played through the game several times without problem.

I'm currently going through as a ranger and I'm at the conclusion of chapter 2 at the pinnacle of the host tower.

For some reason, neither Maugrim, Aribeth, or Morag seem to notice me, and their conversation will not start.

I've tried talking to them, and the big gate is indestructable.
I've tried killing all the lizard folk to incite them.
I've tried summoning a creature inside the gate.
I've tried loading quicksave games, as well as the autosave game from the ambassador's quarters and gone through the whole tower, to no avail.

HELP!
What can I do??

Hm... And you're all patched and up to date?
Is your character 100% legal?
Answering "no" to either of these questions might enlighten me, but if the answer to both is yes, then perhaps someone else can help you.

This has been on the known issues list since the dark ages, you would think they would have fixed it by now. Anyway:

thanks!