Success! Looks like we've fixed this one. According to our records the fix was applied for EXTJS-7228 in 4.2.0.489.
  1. #1
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    Default [4.1.1] Ext.data.Store, if buffered = true, method load() set options.start to NaN

    [4.1.1] Ext.data.Store, if buffered = true, method load() set options.start to NaN


    Ext version tested:
    • Ext 4.1.1
    Description:
    • Default pageSize = undefined.
      If set buffered = true then method load() set options.start = NaN (proxy requests wrong operation.start = NaN).
      See next source code of Ext.data.Store.

    1)
    Set config store (on define/create store): buffered = true.
    Default config is:
    pageSize = undefined,
    In constructor:

    Code:
     constructor: function(config) {
     ...
             if (me.buffered) {
                 me.pageMap = new me.PageMap({
                     pageSize: me.pageSize, //here pageSize set to undefined
                     ...
                 });
             ....
              }
     ...
     
             // Page size for non-buffered Store defaults to 25
             // For a buffered Store, the default page size is taken from the initial call to prefetch.
             if (!me.buffered && !me.pageSize) {
                 me.pageSize  = me.defaultPageSize;
            
            //here pageSize is undefined
     
     ...
     }
    2)
    call store.load(); Then
    Code:
         load: function(options) {
             var me = this;
     
             options = options || {};
     
             if (typeof options == 'function') {
                 options = {
                     callback: options
                 };
             }
     
             options.groupers = options.groupers ||  me.groupers.items;
             options.page = options.page || me.currentPage;
             options.start = (options.start !== undefined) ? options.start : (options.page - 1) * me.pageSize;
             //here options.start is NaN
    Then options.start = NaN.

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    Thanks for the report! I have opened a bug in our bug tracker.

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