reRender not working

Question

Hey guys, i have this code below

<rich:tab id="tabProcessos" label="Processos">
<a4j:outputPanel id="processos">                        
    <h:form>
        <rich:dataTable width="800px" value="#{reservaGeralController.lstProcessos}" rendered="#{!empty reservaGeralController.lstProcessos}" var="processoHistorico" id="processosTabela">
            <rich:column width="200px" sortBy="#{processoHistorico.dtHrHistorico}" >
                <f:facet name="header"><h:outputText value="Data"/></f:facet>
                <h:outputText styleClass="Fonte02" value="#{processoHistorico.dtHrHistorico}" >
                    <f:convertDateTime pattern="dd/MM/yyyy HH:mm:ss" timeZone="#{reservaGeralController.idTimeZone}"/>
                </h:outputText>
            </rich:column>                          
            <rich:column width="300px" sortBy="#{processoHistorico.processo.dsProcesso}">
                <f:facet name="header"><h:outputText value="Descrição"/></f:facet>
                <h:outputText styleClass="Fonte02" value="#{processoHistorico.processo.dsProcesso}" />
            </rich:column>
            <rich:column width="300px">
                <f:facet name="header"><h:outputText value="Histórico SAC"/></f:facet>
                <a4j:repeat value="#{processoHistorico.processoHistoricoSacCollection}" var="processoSac">
                    <strong>(#{processoSac.dsLoginAtendente}):</strong> #{processoSac.dsComplemento}
                </a4j:repeat>
            </rich:column>
        </rich:dataTable>
    </h:form>
</a4j:outputPanel>              

Any idea? Tks.