The mashup does not load when you load the same mashup again based on certain conditions.

When the postMessage handler registration on the host fails, you cannot load the same mashup again based on certain conditions. The postMessage handler registration must be successful to allow resizing and communication between the host page and gadget.

1. Put a debugger in the HostActionProcessor or GadgetActionProcessor . If the debugger does not stop, then invoke pega.Mashup.Communicator.register (pega.Mashup.hostActionsProcessor) and _initAllPegaObjects() when the mashup script is loaded for the first time.
2. For subsequent new mashup <div> snippets that you add, invoke _initAllPegaObjects().
   For example: See the following code sample:

   pega.Mashup.hostActionsProcessor = function(notifiedData){
   
     var gadgetIfrName = notifiedData.src,
   
         actionInfo = notifiedData.payload,gadgetId,gadget;
   
     gadgetId = gadgetIfrName;
   
     if(gadgetIfrName && gadgetIfrName.match(/Ifr$/)){
   
       gadgetId = gadgetIfrName.substring(0, gadgetIfrName.length-3);
   
     }                
   
     gadget = pega.web.mgr._getGadgetByID(gadgetId);
   
     if(!gadget){
   
       return;
   
     }
   
     switch(actionInfo.name) {
   
       case "loaded":
   
         if(pega.web.isWebMashup && gadget._oFrame) {
   
         
   
           //resetting height for initial mashup load , removing skeleton height
   
           if(gadget._bMaxIframeSize && gadget._oFrame.style.height == "400px"){
   
             gadget._oFrame.style.height = "";
   
           }
   
           //console.info("hostActionsProcessor: loaded");
   
           pega.Mashup.Communicator.send({name: "registerResize"}, {
   
             target: gadgetIfrName
   
           });
   
         }
   
         //console.info("hostActionsProcessor: registerResize");
   
         gadget._oDiv.pyStreamName = actionInfo.pyStreamName;
   
         break;
   
       case "resizeMashup":
   
         var height = actionInfo.height;
   
   
   <script>
               
   
   function loadMashup() {
   
        var snippetDiv = document.createElement("div");
   
        snippetDiv.setAttribute("data-pega-gadgetname", "PegaGadget");
   
        snippetDiv.setAttribute("data-pega-action", "createNewWork");
   
        snippetDiv.setAttribute("data-pega-action-param-classname", "OES023-Myapplication-Work-Interaction");
   
        snippetDiv.setAttribute("data-pega-action-param-flowname", "pyStartCase");
   
        snippetDiv.setAttribute("data-pega-isdeferloaded", "false");
   
        snippetDiv.setAttribute("data-pega-threadname", "MashupThread");
   
        snippetDiv.setAttribute("data-pega-applicationname", "Myapplication");
   
        snippetDiv.setAttribute("data-pega-resizetype", "stretch");
   
        snippetDiv.setAttribute("data-pega-url", "http://sample.pega.com/prweb");
   
        snippetDiv.setAttribute("data-pega-action-param-parameters", JSON.stringify({
   
            "UserIndentifier": "cherj",
   
            "Password": "xyzdkjmv"
   
        }) + "");
   
   
        document.getElementById("wrapperDiv").appendChild(snippetDiv);
   
        if (pega && pega.Mashup) {
   
            //if mashup script already loaded
   
            _initAllPegaObject();
   
        } else {
   
            // load mashup scripts on-demand
   
            var mashupScriptElement = document.createElement("script");
   
            mashupScriptElement.onload = function () {
   
                // 1. register post message communicator
   
                pega.Mashup.Communicator.register(pega.Mashup.hostActionsProcessor);
   
                // 2. trigger mashup loading explicitly for asyn case
   
                _initAllPegaObjects();
   
   
            };
   
            mashupScriptElement.src = "http://samples.pega.com/prweb?pyActivity=pzIncludeMashupScripts";
   
            document.head.appendChild(mashupScriptElement);
   
        }
   
    } 
   
   </script
   
   <div id="wrapperDiv"></div>
   
   <button onclick="loadMashup">Load Mashup</button>