When using IE 11 and Jasper Reports 6.3 either the login button is grayed out or once you are logged in the page formatting looks incorrect.
This is due to a setting on the Jasper server
Force the Edge mode for IE by modifying the following section in the <Tomcat Install Directory>/WEBAPPS/JASPERSERVER-PRO/WEB-INF/decorators/decorator.jsp file on the JasperSoft Server:
<meta http-equiv="X-UA-Compatible" content="IE=8"/>
Uncomment this section, and then set content to "IE=Edge" instead of "IE=8".
<meta http-equiv="X-UA-Compatible" content="IE=Edge"/>