Not sure it is out of spec or ZK should tolerate this.

<zk>
	<label multiline="true">
	Issue : get IndexOutOfBoundsException
	1.click select, it will select last one
	2.click delete, it will remove last one (get exception here if bug doesn't fixed)
	
	</label>
	<div width="400px" >
		<listbox id="listbox" mold="paging" pageSize="10">
			<listhead>
				<listheader label="name" />
			</listhead>
			<template name="model" >
				<listitem>
					<listcell label="${each.name}" />
				</listitem>
			</template>
		</listbox>
		<button label="select" onClick="select()"/>
		<button label="delete" onClick="delete()"/>
	</div>
<zscript><![CDATA[
	//set to false will avoid it, 
	//however MVVM use liveModel..
    boolean useLive = true;               
                  
	class Item {
		String name;
		public Item() {
			
		}
		public Item(String name) {
			this.name = name;
		}

		public String getName() {
			return name;
		}

		public void setName(String name) {
			this.name = name;
		}
		
	}
	List itemList = new LinkedList();
	for (int i = 0; i < 10; i++) {
		itemList.add(new Item("item " + i));
	}
	ListModelList listModelList = new ListModelList(itemList,true);//if use live list
	listbox.setModel(listModelList);
	
	Item selected;
	public void select(){
		listModelList.addToSelection(selected = itemList.get(itemList.size()-1));
	}
	public void delete(){
		//remove selected for original list
		itemList.remove(selected);
				
		//make a non existed object into selection		
		selected = new Item("A");
		listModelList.addToSelection(selected);
		
		//update the model
		listbox.setModel(listModelList = new ListModelList(itemList,true));
	}
]]>
</zscript>
</zk>

>>java.lang.IndexOutOfBoundsException: Index: 9, Size: 9
>> at java.util.LinkedList.entry(LinkedList.java:365)
>> at java.util.LinkedList.get(LinkedList.java:315)
>> at org.zkoss.zul.ListModelList.getElementAt(ListModelList.java:150)
>> at org.zkoss.zul.Listbox.doSelectionChanged(Listbox.java:2580)
>> at org.zkoss.zul.Listbox.onListDataChange(Listbox.java:2534)
>> at org.zkoss.zul.Listbox.access$17(Listbox.java:2521)
>> at org.zkoss.zul.Listbox$4.onChange(Listbox.java:461)
>> at org.zkoss.zul.AbstractListModel.fireEvent(AbstractListModel.java:61)
>> at org.zkoss.zul.ListModelList.fireSelectionEvent(ListModelList.java:438)
>> at org.zkoss.zul.AbstractListModel.addToSelection(AbstractListModel.java:130)
>> 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 bsh.Reflect.invokeMethod(Unknown Source)
>> at bsh.Reflect.invokeObjectMethod(Unknown Source)
>> at bsh.Name.invokeMethod(Unknown Source)
>> at bsh.BSHMethodInvocation.eval(Unknown Source)
>> at bsh.BSHPrimaryExpression.eval(Unknown Source)
>> at bsh.BSHPrimaryExpression.eval(Unknown Source)
>> at bsh.BSHBlock.evalBlock(Unknown Source)
>> at bsh.BSHBlock.eval(Unknown Source)
>> at bsh.BshMethod.invokeImpl(Unknown Source)
>> at bsh.BshMethod.invoke(Unknown Source)
>> at bsh.BshMethod.invoke(Unknown Source)
>> at bsh.Name.invokeLocalMethod(Unknown Source)
>> at bsh.Name.invokeMethod(Unknown Source)
>> at bsh.BSHMethodInvocation.eval(Unknown Source)
>> at bsh.BSHPrimaryExpression.eval(Unknown Source)
>> at bsh.BSHPrimaryExpression.eval(Unknown Source)
>> at bsh.Interpreter.eval(Unknown Source)
>> at bsh.Interpreter.eval(Unknown Source)
>> at org.zkoss.zk.scripting.bsh.BSHInterpreter.exec(BSHInterpreter.java:131)
>> at org.zkoss.zk.scripting.util.GenericInterpreter.interpret(GenericInterpreter.java:328)
>> at org.zkoss.zk.ui.impl.PageImpl.interpret(PageImpl.java:875)
>> at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2701)
>> at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:2654)
>> at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:136)
>> at org.zkoss.zk.ui.impl.UiEngineImpl.processEvent(UiEngineImpl.java:1710)
>> at org.zkoss.zk.ui.impl.UiEngineImpl.process(UiEngineImpl.java:1495)
>> at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1205)
>> at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:583)
>> at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:481)
>> at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:489)
>> at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
>> at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>> at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
>> at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)
>> at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
>> at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
>> at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
>> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
>> at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
>> at org.mortbay.jetty.Server.handle(Server.java:326)
>> at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
>> at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)
>> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
>> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
>> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
>> at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
>> at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)