It works fine if I export ~600 records.  But when I try it on 9000 or more the export breaks.  Looking at the file in a text editor I'm getting a small amount of garbage at the end of the file.
        <Row ss:Index="9399" ss:StyleId="s154" ss:AutoFitHeight="0" ss:Height="22">
         </Row>
mber" >-      </Table>
    </Worksheet>
  </Workbook>
If I delete everything before the </Table> the file looks to be fine as I can open it with an xml viewer or spread sheet program.  As far as I can tell all the data is their.
NetTalk: 8.68
Thanks
Matthew