Ng-view and ion-nav-view only work on IBM MobileFirst when using beta.1 version of ionic.css

Both ng-view and ion-nav-view only work on MobileFirst when using the ionic.css file v1.0.0-beta.1, they do not work when using other versions of ionic.css.

I am using ionic.bundle.js for my application. Codes can be found here: https://github.com/bbkoay/mobilefirst-ionic-tutorial-application.

Does anyone know about this issue?