For some reason the following code (which triggers parent-page functions) will not work in IE11. Its been working fine uptil now but no longer. To note: I have tried to turn off Protected mode (which is not a solution for customers) but this didn't work either!
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="X-UA-Compatible" content="IE=8" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Register</title>
<script type="text/javascript" src="https://code.jquery.com/jquery-latest.min.js"></script>
</head>
<body>
<script type="text/javascript">
var accounts = window.opener.$('input[name="accounts_added"]');
var text = window.opener.$('#counter_$id');
$(accounts).val(parseInt($(accounts).val()) + 1);
//window.opener.$('input[name="subBtn"]').show();
window.opener.updateAjaxbox();
window.close();
</script>
</body>