[Sorry, I never got an email to notify me of this message; hope this is not too late]
I have a suspicion this has to do with timing and determening when a page is fisnished loading.
I have released a beta version after you send this message, that re-implements the wait_while_busy logic in order to get a better indication of when IE has actually finished loading a page and put all the object's information in place.
Could you please try it and see if it solves your problem and let me know?

-- Abe.