I have rich:tree on my facelet. I can select only one node. When I click on other node then nothing happens. In log I found this :

ERROR STDERR - TreeRendererBase.encodeAjaxChildren()[1]

However when i modify the tree model i.e. add child node then I can select other node, but still only once, and then nothing else.
Any ideas what is wrong ?

<h:form>
 <a4j:outputPanel id="trees">
 <a4j:status startText="Request in progress..." stopText="Request finished"/>
 <rich:tree value="#{systemRoot}" var="item" switchType="ajax"
 nodeSelectListener="#{categoryManager.processSelection}"
 ajaxSubmitSelection="true">
 <rich:treeNode>#{item.name}</rich:treeNode>
 </rich:tree>
 </a4j:outputPanel>
 <h:inputText value="#{categoryName}"/>
 <a4j:commandButton value="#{messages.add}" action="addCategory" reRender="trees"/>
 </h:form>