This problem may be related to compatibility mode IE9
Enter this code in the header:
<meta http-equiv="X-UA-Compatible" content="IE=8"/>
Open the file header.php
Locate this line and paste the code below.
<html xmlns="http://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>
You will be goes like:
<html xmlns="http://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>
<meta http-equiv="X-UA-Compatible" content="IE=8"/>