Following sequence used to create a Feature on a shape file layer 1. Selected layer in Layer context 2. Selected "Add or Move Feature Geometry Vertices" tool in tool bar 3. Created a polygon on Map 4. Selected Refresh Map 5. New polygon appeared on the Map 6. Selected "Select Features By Drawing a Rectangle" tool in tool bar The "Add or Move Feature Geometry Vertices" tool did not toggle off when "Select Features By Drawing a Rectangle" tool was applied. Unable to perform other operations. Everytime, select a Layer in Layer Context an error message appears. Background progress bar was working continuously. Had to exit UDig to reset system. Error log printout as follows(Null Pointer Exception repeated every second only last NullPointerException stack trace shown): !ENTRY net.refractions.udig.project 2 0 2005-01-19 15:01:43.75 !MESSAGE !STACK 0 java.lang.NullPointerException at net.refractions.udig.render.internal.feature.basic.BasicFeatureRenderer.prepareDraw(BasicFeatureRenderer.java:120) at net.refractions.udig.render.internal.feature.basic.BasicFeatureRenderer.render(BasicFeatureRenderer.java:85) at net.refractions.udig.render.internal.feature.basic.BasicFeatureRenderer.render(BasicFeatureRenderer.java:148) at net.refractions.udig.project.render.impl.RenderExecutorImpl$RenderJob.run(RenderExecutorImpl.java:72) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:66) !ENTRY org.eclipse.ui 4 4 2005-01-19 15:01:44.758 !MESSAGE Unhandled event loop exception !ENTRY org.eclipse.ui 4 0 2005-01-19 15:01:44.758 !MESSAGE Widget is disposed !STACK 0 org.eclipse.swt.SWTException: Widget is disposed at org.eclipse.swt.SWT.error(SWT.java:2827) at org.eclipse.swt.SWT.error(SWT.java:2752) at org.eclipse.swt.SWT.error(SWT.java:2723) at org.eclipse.swt.widgets.Widget.error(Widget.java:388) at org.eclipse.swt.widgets.Widget.checkWidget(Widget.java:290) at org.eclipse.swt.widgets.Widget.getData(Widget.java:466) at org.eclipse.ui.presentations.PresentationUtil$4.handleEvent(PresentationUtil.java:75) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:833) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2803) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2448) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1569) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1540) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:285) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:144) at net.refractions.udig.internal.ui.UDIGApplication.run(UDIGApplication.java:31) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:220) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:273) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:129) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.core.launcher.Main.basicRun(Main.java:185) at org.eclipse.core.launcher.Main.run(Main.java:710) at org.eclipse.core.launcher.Main.main(Main.java:694)