Put this code on your Divi functions.php
if ( isset($_SERVER['HTTP_USER_AGENT']) && stristr( $_SERVER['HTTP_USER_AGENT'],"mac") ) {
$classes[] = 'osx';
} elseif ( isset($_SERVER['HTTP_USER_AGENT']) && stristr( $_SERVER['HTTP_USER_AGENT'],"linux") ) {
$classes[] = 'linux';
} elseif ( isset($_SERVER['HTTP_USER_AGENT']) && stristr( $_SERVER['HTTP_USER_AGENT'],"windows") ) {
$classes[] = 'windows';
}
This will fix this issue.
I installed on latest WP it is working good.. so it should be your environment issue.. This is really good plugin..