App config prodMode not working

All screens are blank in Android if I run app with –prod option. (Please see my post https://forum.ionicframework.com/t/ionic-run-prod-white-screeen/73398/19) I have also tried to start a new --v2 ionic app and migrated my code to its new structure. But --prod option generates an app whose screen are all blanks. I have tried also to remove plugins and add one by one. Nothing seems to solve. Please help!!!