Can't access Thieves' maze

Hi,
First playthrough of BG:EET. Got all the way to the end of BG:EE - ducal palace confrontation complete, Sarevok teleported away, Duke Belt teleported me to the Thieves' Guild. But the thief doesn't greet me when I get there and tell me where he went, and I can't access the stairs to go down. Tried going back the palace, and Belt just teleports me back again with the same result - I can't get down to the maze.
-FP
First playthrough of BG:EET. Got all the way to the end of BG:EE - ducal palace confrontation complete, Sarevok teleported away, Duke Belt teleported me to the Thieves' Guild. But the thief doesn't greet me when I get there and tell me where he went, and I can't access the stairs to go down. Tried going back the palace, and Belt just teleports me back again with the same result - I can't get down to the maze.
-FP
0