Don't forget a large part of the Jaheira romance script is triggered by several events, like running off to the Harper Hideout and all... And since this bug fix seems to start the entire script all over again, you'll have to go through those events as well. But since the variables of those events are already changed when you've passed this point in the game, the romance script will end up in a deadlock. I believe it only works if you restart the game with the bug fix already installed... Don't pin me down on it, perhaps the Baldurdash Team will slap me with a large trout for giving wrong information like this
, but it's my best shot at the situation...