Data Modeler: Editing or creating a view "crashes"

Hi all,
some days ago I've created a view in my relational model using the data modeler (SQL Developer 3.2.20.09). Today I wanted to add some more columns. Unfortunately the property pane doesn't open any more when double clicking the view object (for the tables it still works). No error message is shown. In the logical view a red triangle is shown in the top left corner of the view object.
When I try to create a totally new view then the data modeler /sql developer crashes (doesn't respond anymore)...
What could be the reason?
If also tried with the new version of SQL Developer - there it doesn't work either...
Thanks in advance
Matthias

Or this one:
2014-01-22 16:49:32,665 [AWT-EventQueue-0] ERROR DefaultDiagramUI - DefaultDiagramUI.paint:
java.lang.NullPointerException
at oracle.dbtools.crest.swingui.diagram.graph.EdgeRenderer.getForeground(Unknown Source)
at javax.swing.JComponent.setForeground(JComponent.java:2679)
at oracle.dbtools.crest.swingui.diagram.graph.EdgeRenderer.installAttributes(Unknown Source)
at oracle.dbtools.crest.swingui.diagram.graph.EdgeRenderer.setView(Unknown Source)
at oracle.dbtools.crest.swingui.diagram.graph.EdgeRenderer.getRendererComponent(Unknown Source)
at oracle.dbtools.crest.swingui.diagram.graph.AbstractCellView.getRendererComponent(Unknown Source)
at oracle.dbtools.crest.swingui.diagram.ui.def.DefaultDiagramUI.paintCell(Unknown Source)
at oracle.dbtools.crest.swingui.diagram.ui.def.DefaultDiagramUI.paint(Unknown Source)
at javax.swing.plaf.ComponentUI.update(ComponentUI.java:143)
at javax.swing.JComponent.paintComponent(JComponent.java:760)
at javax.swing.JComponent.paint(JComponent.java:1037)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at oracle.dbtools.crest.swingui.diagram.OverviewPanel.paintChildren(Unknown Source)
at javax.swing.JComponent.paint(JComponent.java:1046)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at javax.swing.JComponent.paint(JComponent.java:1046)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at javax.swing.JComponent.paint(JComponent.java:1046)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at javax.swing.JComponent.paint(JComponent.java:1046)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at javax.swing.JComponent.paint(JComponent.java:1046)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at javax.swing.JComponent.paint(JComponent.java:1046)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at javax.swing.JComponent.paint(JComponent.java:1046)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at javax.swing.JComponent.paint(JComponent.java:1046)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at javax.swing.JComponent.paint(JComponent.java:1046)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at javax.swing.JComponent.paint(JComponent.java:1046)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at javax.swing.JComponent.paint(JComponent.java:1046)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at javax.swing.JComponent.paint(JComponent.java:1046)
at javax.swing.JLayeredPane.paint(JLayeredPane.java:567)
at javax.swing.JComponent.paintChildren(JComponent.java:870)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5139)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1491)
at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1422)
at javax.swing.RepaintManager.paint(RepaintManager.java:1225)
at javax.swing.JComponent.paint(JComponent.java:1023)
at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
at java.awt.Container.paint(Container.java:1778)
at java.awt.Window.paint(Window.java:3390)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:797)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714)
at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:694)
at javax.swing.RepaintManager.access$700(RepaintManager.java:41)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1636)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:666)
at java.awt.EventQueue.access$400(EventQueue.java:81)
at java.awt.EventQueue$2.run(EventQueue.java:627)
at java.awt.EventQueue$2.run(EventQueue.java:625)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:636)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

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