Attempt to fix GUI threading bug in GUI simulator "plot path" feature.

prism/src/userinterface/simulator/SimPathPlotThread.java

@@ -26,6 +26,8 @@
 
 package userinterface.simulator;
 
+import javax.swing.SwingUtilities;
+
 import prism.PrismException;
 import simulator.GenerateSimulationPath;
 import simulator.SimulatorEngine;
@@ -51,6 +53,10 @@ public class SimPathPlotThread extends GUIComputationThread
 		this.graphModel = graphModel;
 	}
 
+	public void run()
+	{
+		SwingUtilities.invokeLater(new Runnable()
+		{
 			public void run()
 			{
 				try {
@@ -65,4 +71,6 @@ public class SimPathPlotThread extends GUIComputationThread
 					error(e.getMessage());
 				}
 			}
+		});
+	}
 }