WP-AppKit version 1.5.2 has dropped support for CrossWalk. If you need to re-activate it for your app you can add the following to any php file in the php directory of your WP-AppKit theme (for example wp-content/themes-wp-appkit/q-android/php/reactivate-crosswalk.php):
add_filter( 'wpak_crosswalk_activated', '__return_true' );
