BT, DT, though the "zapped away" part is a new one.
I got a long letter from lucasarts.com tech support today, but it seemed to be a catchall for any sort of problem that could occur. All about programs running in the system tray and memory sizes and other silly stuff their program should not care about.
The real workaround is to get a savegame from some time before you get Urgon's part, and don't save between getting Urgon's part and finishing the level. I had to start all of Shambala over, since all I did was quicksave, but it worked.