I'm getting consistent crashes in the Work Items View, when I pull-down the context menu and select relationships or columns.  It crashes right after I select the  relationship or the column in the popup dialog.
RTC 502
Eclipse 451, also in 452
Red Hat Enterprise Linux 7.2, Gnome 3
I believe this is the relevant part of the core dump:

1XMCURTHDINFO  Current thread
3XMTHREADINFO      "main" J9VMThread:0x00000000019B3500, j9thread_t:0x00007F7B78007490, java/lang/Thread:0x0000000700097DC8, state:R, prio=6
3XMJAVALTHREAD            (java/lang/Thread getId:0x1, isDaemon:false)
3XMTHREADINFO1            (native thread ID:0x7B85, native priority:0x6, native policy:UNKNOWN, vmstate:R, vm thread flags:0x00000000)
3XMTHREADINFO2            (native stack address range from:0x00007F7B7F6AE000, to:0x00007F7B7FEAF000, size:0x801000)
3XMCPUTIME               CPU usage total: 18.484269731 secs, current category="Application"
3XMHEAPALLOC             Heap bytes allocated since last GC cycle=44838128 (0x2AC2CF0)
3XMTHREADINFO3           Java callstack:
4XESTACKTRACE                at org/eclipse/swt/internal/gtk/OS._gtk_tree_store_set(Native Method)
4XESTACKTRACE                at org/eclipse/swt/internal/gtk/OS.gtk_tree_store_set(OS.java:13195)
4XESTACKTRACE                at org/eclipse/swt/widgets/Tree.destroyItem(Tree.java:1033)
4XESTACKTRACE                at org/eclipse/swt/widgets/TreeColumn.destroyWidget(TreeColumn.java:215)
4XESTACKTRACE                at org/eclipse/swt/widgets/Widget.release(Widget.java:1148)
4XESTACKTRACE                at org/eclipse/swt/widgets/Widget.dispose(Widget.java:478)
4XESTACKTRACE                at com/ibm/team/workitem/rcp/ui/internal/viewer/WorkItemViewer.updateColumns(WorkItemViewer.java:484)
4XESTACKTRACE                at com/ibm/team/workitem/rcp/ui/internal/viewer/WorkItemViewer.setInput(WorkItemViewer.java:317)
4XESTACKTRACE                at com/ibm/team/workitem/rcp/ui/internal/explorer/view/AbstractWorkItemExplorer.show(AbstractWorkItemExplorer.java:566)
4XESTACKTRACE                at com/ibm/team/workitem/rcp/ui/internal/explorer/view/WorkItemExplorer2.show(WorkItemExplorer2.java:538)
4XESTACKTRACE                at com/ibm/team/workitem/rcp/ui/internal/explorer/view/AbstractWorkItemExplorer.show(AbstractWorkItemExplorer.java:578)
4XESTACKTRACE                at com/ibm/team/workitem/rcp/ui/internal/explorer/view/AbstractWorkItemExplorer$3.runInUI(AbstractWorkItemExplorer.java:452)
4XESTACKTRACE                at com/ibm/team/jface/internal/util/UIUpdateManager$ForegroundJob.runProtectedInUI(UIUpdateManager.java:94)
4XESTACKTRACE                at com/ibm/team/jface/internal/util/LoggingUIJob.runInUIThread(LoggingUIJob.java:71)
4XESTACKTRACE                at org/eclipse/ui/progress/UIJob$1.run(UIJob.java:97(Compiled Code))
4XESTACKTRACE                at org/eclipse/swt/widgets/RunnableLock.run(RunnableLock.java:35(Compiled Code))
4XESTACKTRACE                at org/eclipse/swt/widgets/Synchronizer.runAsyncMessages(Synchronizer.java:135(Compiled Code))
5XESTACKTRACE                   (entered lock: org/eclipse/swt/widgets/RunnableLock@0x00000007EED9EF18, entry count: 1)
4XESTACKTRACE                at org/eclipse/swt/widgets/Display.runAsyncMessages(Display.java:3794(Compiled Code))
4XESTACKTRACE                at org/eclipse/swt/widgets/Display.readAndDispatch(Display.java:3433(Compiled Code))
4XESTACKTRACE                at org/eclipse/e4/ui/internal/workbench/swt/PartRenderingEngine$4.run(PartRenderingEngine.java:1127)
4XESTACKTRACE                at org/eclipse/core/databinding/observable/Realm.runWithDefault(Realm.java:337)
4XESTACKTRACE                at org/eclipse/e4/ui/internal/workbench/swt/PartRenderingEngine.run(PartRenderingEngine.java:1018)
4XESTACKTRACE                at org/eclipse/e4/ui/internal/workbench/E4Workbench.createAndRunUI(E4Workbench.java:156)
4XESTACKTRACE                at org/eclipse/ui/internal/Workbench$5.run(Workbench.java:694)
4XESTACKTRACE                at org/eclipse/core/databinding/observable/Realm.runWithDefault(Realm.java:337)
4XESTACKTRACE                at org/eclipse/ui/internal/Workbench.createAndRunWorkbench(Workbench.java:606)
4XESTACKTRACE                at org/eclipse/ui/PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
4XESTACKTRACE                at org/eclipse/ui/internal/ide/application/IDEApplication.start(IDEApplication.java:139)
4XESTACKTRACE                at org/eclipse/equinox/internal/app/EclipseAppHandle.run(EclipseAppHandle.java:196)
4XESTACKTRACE                at org/eclipse/core/runtime/internal/adaptor/EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
4XESTACKTRACE                at org/eclipse/core/runtime/internal/adaptor/EclipseAppLauncher.start(EclipseAppLauncher.java:104)
4XESTACKTRACE                at org/eclipse/core/runtime/adaptor/EclipseStarter.run(EclipseStarter.java:380)
4XESTACKTRACE                at org/eclipse/core/runtime/adaptor/EclipseStarter.run(EclipseStarter.java:235)
4XESTACKTRACE                at sun/reflect/NativeMethodAccessorImpl.invoke0(Native Method)
4XESTACKTRACE                at sun/reflect/NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:95)
4XESTACKTRACE                at sun/reflect/DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
4XESTACKTRACE                at java/lang/reflect/Method.invoke(Method.java:507)
4XESTACKTRACE                at org/eclipse/equinox/launcher/Main.invokeFramework(Main.java:669)
4XESTACKTRACE                at org/eclipse/equinox/launcher/Main.basicRun(Main.java:608)
4XESTACKTRACE                at org/eclipse/equinox/launcher/Main.run(Main.java:1515)
4XESTACKTRACE                at org/eclipse/equinox/launcher/Main.main(Main.java:1488)