Ok with some help from a forum member on my site who supplied the code mods
Nomad3k (thanks)
I think I have tracked down the problem and have a fix:
original code in default\Display.template.php:
if (empty($settings['use_tabs']))
echo '
<script language="JavaScript" type="text/javascript"><!-- // --><![CDATA[
document.getElementById("quickmodSubmit").style.display = "none";
// ]]></script>';
echo '
</form>';
Replace with this code:
if (empty($settings['use_tabs']))
echo '
<script language="JavaScript" type="text/javascript"><!-- // --><![CDATA[
var scriptfix = document.getElementById("quickmodSubmit");
if (scriptfix != null)
scriptfix.style.display = "none";
// ]]></script>';
echo '
</form>';