Application interface blanks out....

Hi I've written a rather large Java program. I've never been very interested in the GUI side of things, but as a consequence of people complaining that my GUI was non-intuitive I've had to redo it.
Anyway, I've just recently noticed that when the back-end of my program is occupied (i.e. processing) that my interface doesn't display anything. It seems that I have taken the thread that controls the appearance of my interface away from it and then whenever I click on other applications and have them display on top of my java application, then minimize them, their interface is still within my program interface's window.
Just recently I've added the ability of my program to show the user progress. So I would like my interface to always be visible. Typical run time of my program's back end can be over an hour, so naturally I would like to keep the user informed.
Can someone tell me what I have done wrong in terms of allowing the GUI to maintain a thread for its processing? My back-end is completely threaded, so it shouldn't be "taking the GUI thread away from my GUI"...
Any help or suggestions would be appreciated.
Thanks,
Tim

Hi
Because swing is single threaded, all none gui processing should be none blocking and anything that updates the gui should be berformed on the swing thread.
Use javax.swing.SwingUtilities.invokeLater method to update on the swing thread. and use a new Thread to perform processing work
new Thread() {
public void run() {
}.start();

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