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.
Please help 
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
thank you leanne!
it seems they didn’t find an answer to the problem… i’m going to contact tech support and see waht they have to say.