CommandLink action not being invoked

HI:
I have a page with panelGrid, which has three inputText and one selectOneMenu, all of which have a validator ( a method in the backing bean).
All these are followed by a commandLink button with a 'action' method in the same backing bean.
Problem is when the link is submitted the action method does not get invoked. I placed debug messages and can see that the validator methods are entered but the action method never gets invoked. There are no error messages either.
Any thoughts ?

I found a work around. At least everything is working now. I have to yet test out the entire functionality of my application but here is what I did.
Thanks to the example in the book
JavaServer Faces
By Hans Bergsten
In my main layout page
<%@ taglib prefix="f" uri="/WEB-INF/jsf_core.tld" %>
<%@ taglib prefix="h" uri="/WEB-INF/html_basic.tld" %>
<f:view>
<html>
<h:form>
<%@ include file="../../page1.jspf" %>
</h:form>
<h:form>
<%@ include file="../../page2.jspf" %>
</h:form>
<h:form>
<%@ include file="page3.jspf" %>
</h:form>
</html>
</f:view>

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One strange behavior that I'm facing right now after upgrading to JSF version1.2_12, is that the action method for hidden commandlink which should get fired on changing the value of a comboBox are not getting fired. Note that I was initially using the JSF1.2_07 version and it worked fine.
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Here is a small simple example which could help replicate the problem
There are mainly three files: 1. displayPage.jsp 2. CustomBean.java 3. faces-Config.xml
1. displayPage.jsp (content)
<%@ page session="true" contentType="text/html;charset=utf-8"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
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<head>
<script language="javascript">
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</head>
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</h:form>
</body>
</html>
</f:view>
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private String rowName;
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<!DOCTYPE faces-config PUBLIC
"-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN"
"http://java.sun.com/dtd/web-facesconfig_1_1.dtd">
<faces-config xmlns="http://java.sun.com/JSF/Configuration">
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     <managed-bean-name>customBean</managed-bean-name>
     <managed-bean-class>com.examples.CustomBean</managed-bean-class>
     <managed-bean-scope>request</managed-bean-scope>
     </managed-bean>
</faces-config>
So, if we run above example on JSF 1.2_07, on changing the value of nav-menu, it should submit the form and the action method (updateAction()) defined for commandlink "nav-link" should get fired (one could see the System.out coming on the console) but the moment the JSF jars are upgraded to 1.2_12 the action method no more gets invoked.
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