Activating ENSEMBL while a species on IGB quickload is selected throws an error

Loading a species that has IGB Quickload as a data source THEN activating 'Ensemble' (Pref> Data Source) throws the exception below.

Data sources > configure > Activate ENSEMBL, load Vitis vinifera, no errors. Deselect ENSEMBL. Reselect ENSEMBL, get the following error.
All other species without IGB Quickload do not have this error

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.affymetrix.igb.view.load.GeneralLoadUtils$1.finished(GeneralLoadUtils.java:800)
at com.affymetrix.genometryImpl.thread.CThreadWorker.done(CThreadWorker.java:31)
at javax.swing.SwingWorker$5.run(Unknown Source)
at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(Unknown Source)
at sun.swing.AccumulativeRunnable.run(Unknown Source)
at javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(Unknown Source)
at javax.swing.Timer.fireActionPerformed(Unknown Source)
at javax.swing.Timer$DoPostEvent.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)