Ion-tabs / ion-tab - not aligning to base / footer


I’m running VS2013 Cordova / AngularJS / IonicFramework and have been looking at the KitchenSink demo. When I load this up on the Windows Phone Emulator 720P I have an issue whereby the bottom Tabs do not align with the bottom of the screen:

No Issues with any of the Ripple versions, nor with physical Android device.

Any suggestions as to a fix?