Here is my web.xml (actually a part of it):

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 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-app_2_5.xsd">
 <context-param>
 <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
 <param-value>server</param-value>
 </context-param>
 <context-param>
 <param-name>javax.faces.CONFIG_FILES</param-name>
 <param-value>/WEB-INF/faces-config.xml</param-value>
 </context-param>

 <!-- RICHFACES -->
 <context-param>
 <param-name>org.jboss.jbossfaces.WAR_BUNDLES_JSF_IMPL</param-name>
 <param-value>true</param-value>
 </context-param>
 <context-param>
 <param-name>javax.portlet.faces.RENDER_POLICY</param-name>
 <param-value>NEVER_DELEGATE</param-value>
 </context-param>
 <context-param>
 <param-name>org.ajax4jsf.RESOURCE_URI_PREFIX</param-name>
 <param-value>rfRes</param-value>
 </context-param>
 <context-param>
 <param-name>org.ajax4jsf.cache.LRU_MAP_CACHE_SIZE</param-name>
 <param-value>2048</param-value>
 </context-param>
 <context-param>
 <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
 <param-value>.jsp</param-value>
 </context-param>
 <context-param>
 <param-name>org.richfaces.LoadStyleStrategy</param-name>
 <param-value>DEFAULT</param-value>
 </context-param>
 <context-param>
 <param-name>org.richfaces.LoadScriptStrategy</param-name>
 <param-value>DEFAULT</param-value>
 </context-param>

 <servlet>
 <servlet-name>FacesServlet</servlet-name>
 <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
 <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
 <servlet-name>FacesServlet</servlet-name>
 <url-pattern>*.faces</url-pattern>
 </servlet-mapping>

 <filter>
 <display-name>Ajax4jsf Filter</display-name>
 <filter-name>ajax4jsf</filter-name>
 <filter-class>org.ajax4jsf.Filter</filter-class>
 <init-param>
 <param-name>createTempFiles</param-name>
 <param-value>true</param-value>
 </init-param>
 <init-param>
 <param-name>maxRequestSize</param-name>
 <param-value>10485760</param-value>
 </init-param>
 </filter>

 <filter-mapping>
 <filter-name>ajax4jsf</filter-name>
 <servlet-name>FacesServlet</servlet-name>
 <dispatcher>FORWARD</dispatcher>
 <dispatcher>REQUEST</dispatcher>
 <dispatcher>INCLUDE</dispatcher>
 <dispatcher>ERROR</dispatcher>
 </filter-mapping>
 <!-- RICHFACES -->

 <listener>
 <listener-class>
 com.liferay.portal.kernel.servlet.PortletContextListener</listener-class>
 </listener>
 <servlet>
 <servlet-name>userRenderer</servlet-name>
 <servlet-class>com.liferay.portal.kernel.servlet.PortletServlet</servlet-class>
 <init-param>
 <param-name>portlet-class</param-name>
 <param-value>com.empolis.portlet.EmpolisFacesPortlet</param-value>
 <!-- Subclass of GenericFacesPortlet -->
 </init-param>
 </servlet>
 <servlet-mapping>
 <servlet-name>userRenderer</servlet-name>
 <url-pattern>/userRenderer/*</url-pattern>
 </servlet-mapping>
 <welcome-file-list>
 <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
 <login-config>
 <auth-method>BASIC</auth-method>
 <realm-name>PortalRealm</realm-name>
 </login-config>
</web-app>

Thank you very much for your reply!

Unfortunately the typo is only in this posting, so this is not the problem.
Removing the dispatch is not that simple because the JSF component is a bit more complex and does much more than just including another JSP file.

So, if the dispatch is not possible anymore in this place, we have to drop a feature from our product.

I have only one more question. Is it just not intended (and thus not supported) to use a dispatcher within a component or could this be a bug in the portlet bridge?