I opened a project, created a VDB, saved the VDB, then closed the project. I got this:

Error 2011-01-06 11:26:09.146 Unhandled event loop exception
org.eclipse.swt.SWTException: Failed to execute runnable (org.eclipse.swt.SWTException: Widget is disposed)
at org.eclipse.swt.SWT.error(SWT.java:4083)
at org.eclipse.swt.SWT.error(SWT.java:3998)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:137)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3515)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3164)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
at org.eclipse.equinox.launcher.Main.run(Main.java:1407)
Caused by: org.eclipse.swt.SWTException: Widget is disposed
at org.eclipse.swt.SWT.error(SWT.java:4083)
at org.eclipse.swt.SWT.error(SWT.java:3998)
at org.eclipse.swt.SWT.error(SWT.java:3969)
at org.eclipse.swt.widgets.Widget.error(Widget.java:466)
at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:403)
at org.eclipse.swt.widgets.Table.deselectAll(Table.java:956)
at org.eclipse.jface.viewers.TableViewer.doDeselectAll(TableViewer.java:277)
at org.eclipse.jface.viewers.AbstractTableViewer.setSelectionToWidget(AbstractTableViewer.java:908)
at org.eclipse.jface.viewers.StructuredViewer.setSelectionToWidget(StructuredViewer.java:1741)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1429)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1383)
at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1485)
at org.eclipse.jface.viewers.ColumnViewer.refresh(ColumnViewer.java:537)
at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1444)
at com.metamatrix.modeler.internal.vdb.ui.editor.VdbEditor.vdbNotification(VdbEditor.java:974)
at com.metamatrix.modeler.internal.vdb.ui.editor.VdbEditor$27$1.run(VdbEditor.java:920)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
... 22 more

I'll attach the model project set.