This exception was seen when trying to open a graph track from the Available Data pane:

13:06:56.663 ERROR c.a.genometry.thread.CThreadWorker - com.affymetrix.genoviz.glyph.FillRectGlyph cannot be cast to com.affymetrix.genoviz.glyph.EfficientLabelledGlyph
java.lang.ClassCastException: com.affymetrix.genoviz.glyph.FillRectGlyph cannot be cast to com.affymetrix.genoviz.glyph.EfficientLabelledGlyph
at com.affymetrix.igb.view.layout.FasterExpandPacker.pack(FasterExpandPacker.java:144) ~[na:na]
at com.affymetrix.igb.view.layout.GraphFasterExpandPacker.pack(GraphFasterExpandPacker.java:25) ~[na:na]
at com.affymetrix.genoviz.bioviews.Glyph.pack(Glyph.java:710) ~[na:na]
at com.affymetrix.igb.view.factories.AbstractTierGlyph.pack(AbstractTierGlyph.java:660) ~[na:na]
at com.affymetrix.igb.view.factories.TransformTierGlyph.pack(TransformTierGlyph.java:44) ~[na:na]
at com.affymetrix.igb.glyph.DefaultTierGlyph.pack(DefaultTierGlyph.java:183) ~[na:na]
at com.affymetrix.igb.view.TrackView.addTierFor(TrackView.java:272) ~[na:na]
at com.affymetrix.igb.view.TrackView.addEmptyTierFor(TrackView.java:231) ~[na:na]
at com.affymetrix.igb.view.load.GeneralLoadView$3.runInBackground(GeneralLoadView.java:549) ~[na:na]
at com.affymetrix.genometry.thread.CThreadWorker.doInBackground(CThreadWorker.java:73) ~[na:na]
at javax.swing.SwingWorker$1.call(Unknown Source) [na:1.8.0_45]
at java.util.concurrent.FutureTask.run(Unknown Source) [na:1.8.0_45]
at javax.swing.SwingWorker.run(Unknown Source) [na:1.8.0_45]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.8.0_45]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.8.0_45]
at java.lang.Thread.run(Unknown Source) [na:1.8.0_45]