NPE in mismatch graph

1) run_igb
2) select homo sapiens, H_sapiens_Feb_2009
3) range chr20 : 30,094,422 - 30,298,756
4) load sequence in view
5) load file SRC587518.101029_SN429_0051_A_FC80AT0_IX_PE.001.s_5.gsnap.merged.concordant_uniq.bam
(in dropbox
http://dl.dropbox.com/u/31638443/SRC587518.101029_SN429_0051_A_FC80AT0_IX_PE.001.s_5.gsnap.merged.concordant_uniq.bam
http://dl.dropbox.com/u/31638443/SRC587518.101029_SN429_0051_A_FC80AT0_IX_PE.001.s_5.gsnap.merged.concordant_uniq.bam.bai
)
6) refresh data
7) create a mismatch graph on the + strand

I get:

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 101742
at com.affymetrix.genometryImpl.SeqSymSummarizer.getMismatchGraph(SeqSymSummarizer.java:84)
at com.affymetrix.igb.view.DependentData.createMisMatchGraph(DependentData.java:81)
at com.affymetrix.igb.view.DependentData.createTier(DependentData.java:57)
at com.affymetrix.igb.view.TrackView.addToDependentList(TrackView.java:300)
at com.affymetrix.igb.tiers.SeqMapViewPopup.addMisMatchTier(SeqMapViewPopup.java:654)
. . .