It turns out that SwingWorker is not enough to run native code.
I had a terrible time figuring out why SwingUtilities.invoke* would not launch my runnable.
What I was doing was
MainThread runs starting the mainApp
SwingThread runs gui
SwingworkerThread runs some setup code but...
propertyChangeThread runs the nativeDLL
The nativeDLL calls back into java. That java code attempts to use java.awt.EventQueue.invokeLater to make changes to the GUI. Well, it seems that you cant use EventQueue methods from the thread that propertyChanges are on. Note that whatever the propertyChangeThread actually is, it is NOT the Swing Event Dispatch thread. I checked for that.
Anyway, I created and started a completely new thread to run the DLL code, and everything seems to work much better.
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