Displaying text in JTextPane

I have a problem, i try to display text in a JTextPane with setText() method, but randomly, the application hangs while processing that method. Debugging the code i have found that the application hangs in RepaintManager.addDirtyRegion. My application tries to access to setText() from different threads, but i have encapsulated setText() in a synchronized method, so now i don't have any idea about what is happening...
Does anyone know how i can fix my problem?

ok, thanks for the suggestions, i have tried with different components (JEditorPane, JTextArea) but all components have the same base class, so i have the same problem with all of them...I have tried too using class Document and insertString() but it calls the same functions to repaint the text(RepaintManage.addDirtyRegion)...i'm guessing if it's a problem with threads, but i'm not sure, so if anyone have had the same problem, please post a message...

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Displaying text in JTextPane

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