Tried that a hundred times already. Nothing ever happens.
Bummer. In which case I have no idea, it all worked fine for me. One question though; when you delivered the broken phial to the old boy, and collected your reward of 5 Septms, did you talk to Quintas before you left the store?
The reason I ask is that I have a theory, based on watching a friend play, that the reason why some people have broken quests, or quests not starting, is that the game is heavily dependent on dialogue triggers - skipping, or clicking through, a conversation may stop a trigger from firing down the road. I am not sure how widespread this effect is, but I have solid evidence that it can break/stop at least some quests.