@kolli, it sounds like you are having the same symptoms that I was up until yesterday - perhaps your cause is the same as well…
Apparently the whitelist functionality has been split off into a plugin from Cordova. For many of us, it’s this missing whitelist that’s leading to the white screen / app not loading issue…
Adding the whitelist plugin directly as is described in this thread resolved the white screen issue for me: Crosswalk Integration Beta in Ionic CLI (v1.3.2)