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Hi Miss Lu, This is Jeff. > Description of problem: Creating display: Storm Track > java.lang.ClassCastException > > > > ****************** > Stack trace: > java.lang.ClassCastException > at javax.swing.LayoutComparator.compare(Unknown Source) > at java.util.Arrays.mergeSort(Unknown Source) > I've seen this error now a few times since we've moved to Java 1.6 A complete fix for this is going to be tricky since it happens randomly and in a number of places. We'll be working on it though. If you see it again please send in the error sos we can track it down. Jeff Ticket Details =================== Ticket ID: YPM-633325 Department: Support IDV Priority: Normal Status: Open