Ionic 2 beta 11 white screen on Android 4.4+ only - works on iOS and browser

Using Ionic 2 beta 11, I have an app with the root page using tabs.

App works fine in browser and iOS but on Android it shows a white screen after the splash screen is hidden. Interestingly, if I tap the Recent Apps button and select the app, or home button the switch back to the app, the root page loads.

I have debugged with chrome://inspect and the main app loads, but the tabs page does not load at all the first time the app is run on Android only.

Extract from config.xml

  <preference name="webviewbounce" value="false"/>
  <preference name="UIWebViewBounce" value="false"/>
  <preference name="DisallowOverscroll" value="true"/>
  <preference name="android-minSdkVersion" value="19"/>
  <preference name="BackupWebStorage" value="none"/>
  <preference name="SplashScreenDelay" value="2000"/>
  <preference name="AutoHideSplashScreen" value="false"/>
  <preference name="FadeSplashScreenDuration" value="300"/>
  <preference name="SplashScreen" value="screen"/>
  <preference name="Orientation" value="portrait"/>
  <feature name="StatusBar">
    <param name="ios-package" onload="true" value="CDVStatusBar"/>
  <plugin name="cordova-plugin-device" spec="~1.1.2"/>
  <plugin name="cordova-plugin-console" spec="~1.0.3"/>
  <plugin name="cordova-plugin-whitelist" spec="~1.2.2"/>
  <plugin name="cordova-plugin-splashscreen" spec="~3.2.2"/>
  <plugin name="cordova-plugin-statusbar" spec="~2.1.3"/>
  <plugin name="ionic-plugin-keyboard" spec="~2.2.1"/>

Extract from app.ts

export class MyApp {
  private rootPage: any;

  constructor(private platform: Platform) {
    this.rootPage = TabsPage;

    platform.ready().then(() => {