Drop file make Swing threading rule violation

When dropping a file on the textarea to open it, I get this exception everytime. It means that some components were modified from another thread than the Event Dispatch Thread.
This happens on Ubuntu, but it seems it doesn't happens on Windows 7

org.jvnet.substance.api.UiThreadingViolationException: Component state change must be done on Event Dispatch Thread
at org.jvnet.substance.utils.SubstanceCoreUtilities.testComponentStateChangeThreadingViolation(SubstanceCoreUtilities.java:2385)
at org.jvnet.substance.SubstanceScrollBarUI$3.adjustmentValueChanged(SubstanceScrollBarUI.java:1561)
at javax.swing.JScrollBar.fireAdjustmentValueChanged(JScrollBar.java:675)
at javax.swing.JScrollBar.access$100(JScrollBar.java:64)
at javax.swing.JScrollBar$ModelListener.stateChanged(JScrollBar.java:697)
at javax.swing.DefaultBoundedRangeModel.fireStateChanged(DefaultBoundedRangeModel.java:348)
at javax.swing.DefaultBoundedRangeModel.setRangeProperties(DefaultBoundedRangeModel.java:285)
at javax.swing.JScrollBar.setValues(JScrollBar.java:592)
at javax.swing.plaf.basic.BasicScrollPaneUI.syncScrollPaneWithViewport(BasicScrollPaneUI.java:272)
at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.viewportStateChanged(BasicScrollPaneUI.java:1064)
at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.stateChanged(BasicScrollPaneUI.java:1006)
at javax.swing.JViewport.fireStateChanged(JViewport.java:1384)
at javax.swing.JViewport.setViewPosition(JViewport.java:1140)
at javax.swing.JViewport.scrollRectToVisible(JViewport.java:415)
at javax.swing.JComponent.scrollRectToVisible(JComponent.java:3065)
at javax.swing.JList.ensureIndexIsVisible(JList.java:1118)
at javax.swing.plaf.basic.BasicComboPopup.setListSelection(BasicComboPopup.java:1126)
at javax.swing.plaf.basic.BasicComboPopup.access$300(BasicComboPopup.java:46)
at javax.swing.plaf.basic.BasicComboPopup$Handler.itemStateChanged(BasicComboPopup.java:963)
at javax.swing.JComboBox.fireItemStateChanged(JComboBox.java:1205)
at javax.swing.JComboBox.selectedItemChanged(JComboBox.java:1262)
at javax.swing.JComboBox.contentsChanged(JComboBox.java:1309)
at javax.swing.AbstractListModel.fireContentsChanged(AbstractListModel.java:100)
at javax.swing.DefaultComboBoxModel.setSelectedItem(DefaultComboBoxModel.java:88)
at javax.swing.JComboBox.setSelectedItem(JComboBox.java:557)
at org.gjt.sp.jedit.gui.BufferSwitcher.updateBufferList(BufferSwitcher.java:76)
at org.gjt.sp.jedit.EditPane.bufferAdded(EditPane.java:682)
at org.gjt.sp.jedit.bufferset.BufferSet.addBufferAt(BufferSet.java:130)
at org.gjt.sp.jedit.bufferset.BufferSet.addBuffer(BufferSet.java:267)
at org.gjt.sp.jedit.bufferset.BufferSetManager$2.visit(BufferSetManager.java:142)
at org.gjt.sp.jedit.View.visit(View.java:1321)
at org.gjt.sp.jedit.jEdit.visit(jEdit.java:2867)
at org.gjt.sp.jedit.bufferset.BufferSetManager.addBuffer(BufferSetManager.java:136)
at org.gjt.sp.jedit.jEdit.openFile(jEdit.java:1575)
at org.gjt.sp.jedit.jEdit.openFile(jEdit.java:1512)
at org.gjt.sp.jedit.textarea.TextAreaTransferHandler$DraggedURLLoader.run(TextAreaTransferHandler.java:478)
at org.gjt.sp.util.WorkThread.doRequest(WorkThread.java:213)
at org.gjt.sp.util.WorkThread.doRequests(WorkThread.java:180)
at org.gjt.sp.util.WorkThread.run(WorkThread.java:154)