Hi. As I was trying to put the citations in my work, it appeared a text box saying ‘it was impossible to make an exit call because the application was sending a synchronized call with the exit’ (it was in Portuguese so the translation could not be very accurate) and then it blocks my document… I don’t know what’s happening.
This appears from the forums to be a rare error, and I suggest that you contact Tech support, as a good resolution doesn’t appear to have been available to other users with the issue. See here. Maybe they figured out a better solution in Jan and April 2009