we use richfaces 3.3.2, and got trouble with several modalpanels. sometimes they don't appear.

this is a very critical error for us. if someone could help it would be very nice.

i  found on a website to don't use rerender for the whole modalpanel, as we do. could this be our problem?

code to show the modalpanel is

<a4j:commandButton value="Upload" oncomplete="Richfaces.showModalPanel('upload')" onmouseover="this.style.backgroundColor='#FFFF99'" onmouseout="this.style.backgroundColor=''" action="#{WorkflowPage.cleardocnrversion}" limitToList="true" ajaxSingle="true" process="upload" reRender="upload" >

and modalpanel is

<?xml version="1.0" encoding="ISO-8859-1"?>
<ui:composition  xmlns="http://www.w3.org/1999/xhtml"
                 xmlns:ui="http://java.sun.com/jsf/facelets"
                 xmlns:h="http://java.sun.com/jsf/html"
                 xmlns:f="http://java.sun.com/jsf/core"
                 xmlns:rich="http://richfaces.org/rich"
                 xmlns:a4j="http://richfaces.org/a4j"
                 xmlns:s="http://jboss.com/products/seam/taglib">
<rich:modalPanel id="upload"   height="300"   width="460"  left="30px"   overlapEmbedObjects="true"  zindex="333" rendered="true"   style="overflow:visible">
  <f:facet name="header">
   <h:panelGroup>
    <h:outputText value="Upload"></h:outputText>
   </h:panelGroup>
 
  </f:facet>
    <a4j:form id="uploadform"  style="z-index:333">
         <a4j:queue requestDelay="0" sizeExceededBehavior="dropNew" ignoreDupResponses="true"
    size="50" id="eventQueue" name="eventQueue"/>
   
    <a4j:outputPanel ajaxRendered="true" style="z-index:333">   
    <h:messages id="uploaderror"  styleClass="message"  style="color:red;" />
    </a4j:outputPanel>
       <rich:fileUpload    immediateUpload="true"  addControlLabel="Hinzufügen" maxFilesQuantity="1"    progressLabel="Datei wird übertragen" doneLabel="Datei übertragen" clearControlLabel="Löschen"   clearAllControlLabel="Löschen"  uploadControlLabel="Übertragen"   fileUploadListener="#{Page.listener}" style="z-index:433"  cancelEntryControlLabel="Abbrechen"  listWidth="430px" listHeight="60px"  >
         <a4j:support event="onuploadcomplete"  eventsQueue="eventQueue" action="#{Page.enablesavedoc}"  reRender="btnokupload,docframe" ajaxSingle="true" limitToList="true" ></a4j:support>
       </rich:fileUpload>

  <rich:spacer height="5px"/>
    <rich:separator />
 
       <a4j:commandButton id="btnokupload" value="Speichern" disabled="#{Page.savedok}"  onmouseover="this.style.backgroundColor='#FFFF99'" onmouseout="this.style.backgroundColor=''"
    oncomplete="if ( document.getElementById('uploadform:uploaderror') ==null ) Richfaces.hideModalPanel('upload'); else this.disabled=false;"  
      styleClass="rich-button" action="#{Page.savedok}" reRender="uploadform
      style="width:90px;float:left;margin-left:2px"
      onclick="this.disabled=true"  >
      <rich:toolTip>Speichert das Dokument und schließt den Dialog</rich:toolTip>
   </a4j:commandButton>
       <a4j:commandButton id="btncancelupload" value="Abbrechen" immediate="true"  onmouseover="this.style.backgroundColor='#FFFF99'" onmouseout="this.style.backgroundColor=''"
       onclick="Richfaces.hideModalPanel('upload')" styleClass="rich-button" reRender="upload,docframe" action="#{Page.clearnewmasterdoc}"
      style="width:90px;float:right;margin-right:2px">
      <rich:toolTip direction="bottom-left" >Schließt den Dialog</rich:toolTip>
   </a4j:commandButton>
   </a4j:form>
</rich:modalPanel>
</ui:composition>