A common issue is the Internet Explorer "Compatibility View" which is easily triggered by a user as it is located on the URL bar right next to the refresh button. To disable Compatibility View for your website, include the following in the <head> section of the theme/site.
<meta http-equiv="X-UA-Compatible" content="IE=EDGE" />
Note that our system requires Internet Explorer 8 and above, we do not support Internet Explorer 7 and older browsers.