Hi Bob,
I'm not seeing the error in IE10 but I am seeing something strange going on with the panel (the shaded box) size when you have a lot of text... I've now submitted a fix for it but reluctant to send you a new file because there have been other changes since v2 was released that might conflict with what you have at present, unless you update the HTML5 file set.
If you are able to send me your current gapFill.html file then I will patch it for you and return. Alternatively, if you are able to change line 28 (ish) from this:
$panel.height($x_pageHolder.height() - parseInt($x_pageDiv.css("padding-top")) * 2 - parseInt($panel.css("padding-top")) * 2 - 5);
to
$panel.height(Math.max(
$("#targetHolder").height() + $("#labelHolder").height(),
$x_pageHolder.height() - parseInt($x_pageDiv.css("padding-top")) * 2 - parseInt($panel.css("padding-top")) * 2 - 5
));
then i'm hoping that it will fix your issue. Since i'm unable to reproduce at present I can't guarantee it will solve the issue but at least should let us narrow the issue...
You'll find gapFill.html at /modules/xerte/parent_templates/Nottingham/models_html5/gapFill.html
Regards,
John