Dark brotherhood glitch (spoilers)

#1worldcupfinal11Posted 11/13/2011 3:38:21 PM
During the quest "To kill an empire" I go into the building and talk to the cook gianna but during her conversation with me she suddenly stops speaking mind way through what she was saying. meaning I can no longer carry on the conversation or quest and im stuck in the building with no way out, as you have to have a key to leave...

Did this happen to anyone else? If so were you able to fix it?