IE 9 Issues with Magento

The quick fix is to fool IE9 to “think” it’s acting as IE8 by adding a custom meta tag to the page header like so:

<meta http-equiv="X-UA-Compatible" content="IE=8" />

.htaccess approach

Add this to the end of your .htaccess file:

BrowserMatch MSIE best-standards-support Header set X-UA-Compatible IE=8 env=best-standards-support Latest update is the Prototype JS file is updated in latest version of Magento hope all the issues with IE9 will be fixed.