I tried working around this issue by deleting and adding the edited row back to the table. The results were just as bad.

After running the following commands

/******Start Commands

console.log($('#435_ListingHistoryTable').jqGrid('getGridParam','data')); // Data Before editing

var Data = $('#435_ListingHistoryTable').jqGrid('getRowData',997);
$('#435_ListingHistoryTable').jqGrid('delRowData',997);

console.log($('#435_ListingHistoryTable').jqGrid('getGridParam','data'));// Data after delete

Data.Notes = 'YES DOIN FINE';

$('#435_ListingHistoryTable').jqGrid('addRowData',997, Data);

console.log($('#435_ListingHistoryTable').jqGrid('getGridParam','data'));// Data after add

/******End Commands

I get the following results in firebug

/*****Start results

// Data Before editing

So I found a work around.

It appears the underlying issue was in the GridParam Data not being updated correctly.

So instead of calling the setRowData command I wrote a little function that updated the underlying data and reloaded the grid.

Seems to work fine so far.

console.log($('#435_ListingHistoryTable').jqGrid('getGridParam','data'));

var Data = $('#435_ListingHistoryTable').jqGrid('getGridParam','data');

var RowData = $('#435_ListingHistoryTable').jqGrid('getRowData',997);

for(var i in Data ){