I have just upgraded a Web Project from version 10.2 to version 10.3 (With latest service release), and am getting the following error exporting my grid to Excel

   at Infragistics.Excel.FormattingRun.Equals(Object obj)
   at Infragistics.Excel.FormattedStringElement.HasSameData(GenericCacheElement otherElement)
   at Infragistics.Excel.FormattedStringElement.Equals(Object obj)
   at System.Collections.Generic.ObjectEqualityComparer`1.Equals(T x, T y)
   at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
   at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& value)
   at Infragistics.Excel.GenericCachedCollection`1.Find(T element)
   at Infragistics.Excel.GenericCacheElement.FindExistingOrAddToCache[T](T newElement, GenericCachedCollection`1 collection)
   at Infragistics.Excel.GenericCacheElementProxy`1.AfterSet()
   at Infragistics.Excel.WorksheetShapeWithText.VerifyTextFormattingRuns()
   at Infragistics.Excel.WorksheetCellComment.set_Cell(WorksheetCell value)
   at Infragistics.Excel.WorksheetCell.set_Comment(WorksheetCellComment value)
   at FlashReport.UltraWebGridExcelExporter1_CellExporting(Object sender, CellExportingEventArgs e) in i:\Work_SmartSeries\InforPortal2011\CRSReports\FlashReport.aspx.cs:line 793

    protected void UltraWebGridExcelExporter1_CellExporting(object sender, Infragistics.WebUI.UltraWebGrid.ExcelExport.CellExportingEventArgs e)
    {
        if (e.Value != null)
        {
            if (e.GridRow != null)
            {
                if (e.GridRow.Cells.FromKey(e.GridColumn.BaseColumnName).Title != null)
                {
                    string tooltipText = e.GridRow.Cells.FromKey(e.GridColumn.BaseColumnName).Title;

                    try
                    {
                        e.CurrentWorksheet.Rows[e.CurrentRowIndex].Cells[e.CurrentColumnIndex].Comment = new WorksheetCellComment()
                        {
                            Text = new FormattedString(tooltipText)
                        };
                    }
                    catch (Exception ex)
                    {
                        string temp = ex.Message;
                    }
                }
            }
        }
    }

This was working fine under version 10.2

Thanks

David