-changing proxy URL then loading store does not update grid

I have a grid with a store which is loaded when app is launched. I have a form also to which the grid is bound to. Initially, the grid shows all records. The search form allows user to filter records. The initial load and search URLs are different. When search is clicked, I dynamically change the URL configured on the store proxy to the filter URL, pass in the form values as extraParams, and load the store. I see the request is made and a response is returned. However, my grid records dont refresh.



//grid store inside initComponent

Code:

this.store = Ext.create("Ext.data.Store",{
  fields:["rptid", "text", "value", "date_created", "created_by", "active],
  autoLoad:true,
   proxy:{
      type:"ajax",
      url:"./getRpts.html",
      reader:{
        type:"json",
         root:"data"
       }
   }
});

//handler for form search btn

Code:

    this.getRPTGrid().getStore().getProxy().url = "./getFilteredReports.html";
        this.getRPTGrid().getStore().getProxy().extraParams = 
          this.getSearchForm().getValues();
        this.getRPTGrid().getStore().load();

thats it. I confirm the request is being made to load the store and confirm the response being received in debugger. The JSON response also contains the "data" root so thats not the issue and the fields dont change either. I have done this 10,000 times before but have never experienced this. Anyone have any ideas?

I even compared the Request and Response Headers from both requests and their exactly the same minus the url and params..

grid.getView().refresh() did not work either.

-changing proxy URL then loading store does not update grid