H:commandButton não executa o action - richfaces 4

Estou migrando uma aplicação de Richfaces 3 para Richfaces 4 por causa do ie9. A migração é bastante trabalhosa. O pior é que os métodos associados a h:commandButton não são executados. Alguém poderia me ajudar ? Seguem abaixo os fontes:

web.config

<?xml version="1.0" encoding="UTF-8"?>
<web-app metadata-complete="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>copag</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
   
  <!-- Define a skin do richfaces. Ha varias opcoes -->
  <context-param>
    <param-name>org.richfaces.skin</param-name>
    <param-value>classic</param-value>
  </context-param>
  
  <context-param>     
     <param-name>org.richfaces.CONTROL_SKINNING</param-name>     
    <param-value>enable</param-value>     
  </context-param>
  
  <context-param>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>client</param-value>
  </context-param>
 
  <!--  Filtro -->
  <filter>
  	<filter-name>
  		HibernateSessionFilter
  	</filter-name>
  	<filter-class>br.com.techsage.util.HibernateSessionFilter</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>HibernateSessionFilter</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>    

  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>/faces/*</url-pattern>
    <url-pattern>*.jsf</url-pattern>
  </servlet-mapping>
  <context-param>
    <description>State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2</description>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>client</param-value>
  </context-param>
  <context-param>
    <param-name>javax.servlet.jsp.jstl.fmt.localizationContext</param-name>
    <param-value>resources.application</param-value>
  </context-param>
  <context-param>
  	<param-name>javax.faces.DEFAULT_SUFFIX</param-name>
  	<param-value>.xhtml</param-value>
  </context-param>
  <listener>
    <listener-class>com.sun.faces.config.ConfigureListener</listener-class>
  </listener>
</web-app>

O faces:

<?xml version="1.0" encoding="UTF-8"?>
<faces-config
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
    version="2.0">
    <application>
		<message-bundle>
			messages
		</message-bundle>
		<resource-bundle>
			<base-name>messages</base-name>
			<var>msgs</var>
		</resource-bundle>
		<locale-config>
			<default-locale>pt</default-locale>
			<supported-locale>en</supported-locale>
		</locale-config>
	</application>

	<lifecycle>
		<phase-listener>br.com.techsage.util.LifeCycleListener</phase-listener>
	</lifecycle>
	  
	<managed-bean>
		<managed-bean-name>autenticadorHandler</managed-bean-name>
		<managed-bean-class>br.com.techsage.handler.AutenticadorHandler</managed-bean-class>
		<managed-bean-scope>request</managed-bean-scope>
		<managed-property>
			<property-name>sessao</property-name>
			<value>#{requestScope.sessao}</value>
		</managed-property>
	</managed-bean>		
</faces-config>

Página

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
	xmlns:h="http://java.sun.com/jsf/html"
	xmlns:f="http://java.sun.com/jsf/core"
	xmlns:ui="http://java.sun.com/jsf/facelets"
	xmlns:a4j="http://richfaces.org/a4j"
	xmlns:rich="http://richfaces.org/rich">
<h:head>
	<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
	<meta http-equiv="Pragma" content="no-cache" />
	<meta http-equiv="Cache-Control" content="no-cache" />
	<meta http-equiv="content-language" content="en" />
	<meta content="Developer - Techsage Tecnologia e Informatica Ltda" name="author" />
	<meta http-equiv="Reply-to" content="developer@techsage.com.br" />
	<meta http-equiv="expires" content="Tue, 23 Jun 1998 01:46:05 GMT" />
	<title>..::LOGIN::..</title>
	<link rel="shortcut icon" href="Images/favicon.ico"/>
	<link rel="stylesheet" type="text/css" href="App_Themes/tabelas.css" />
	<link rel="stylesheet" type="text/css" href="App_Themes/estilosSite.css" />
	<script language="javascript" type="text/javascript" src="Scripts/Login.js"></script>
</h:head>
<h:body>
<div id="geral">
	
	<f:loadBundle basename="messages" var="msgs" />
		
	<h:form id="login">
		<div id="pai">
		<div id="topo">
			<img src="Images/logoTechsageTopo.jpg" alt="techsage" name="logoTopo" width="410" height="49" border="0" id="logoTopo" />
		</div>
		<div id="menu"></div>
		<fieldset style="width:770px;">
			<legend>
				<h:outputFormat value="#{msgs['autenticacao']}:"></h:outputFormat>
			</legend>
			
			<p>
				<h:outputLabel for="txtAcesso" value="#{msgs['nomeAcesso']}:"></h:outputLabel>
				<h:inputText id="txtAcesso" maxlength="50" value="#{autenticadorHandler.login}" size="50"></h:inputText>		
			</p>
			
			<p>
				<h:outputLabel for="txtSenha" value="#{msgs['senha']}:"></h:outputLabel>
				<h:inputSecret id="txtSenha" maxlength="10" value="#{autenticadorHandler.senha}" size="10"></h:inputSecret>
			</p>
				
			<p align="center">
				<h:commandButton value="#{msgs['autenticar']}" action="#{autenticadorHandler.autenticar}" onclick="javascript:return logar();"></h:commandButton>
				<h:commandButton value="#{msgs['cancelar']}" action="#{autenticadorHandler.cancelar}"></h:commandButton>
			</p>
			
			<p>
				<h:outputLabel value="#{autenticadorHandler.mensagem}" style="width:200px;color:#ff0000;font-weight:bold;"></h:outputLabel>
			</p>
					
		</fieldset>
		<div id="rodape"></div>
		</div>
	</h:form>
	
</div>
</h:body>
</html>