IOS-Whitescreen with AWS Amplify

This issue is seen on IOS devices only, not simulator. When using the latest AWS amplify library (1.0.4) with the settings below, app always hangs on a whitescreen after splash. If I downgrade amplify to v 0.4.8, application works just fine. Nothing of note is seen in the device logs, atleast from what I see.
Has anyone using amplify come across this?

Ionic Info:

cli packages: (/usr/local/lib/node_modules)

@ionic/cli-utils  : 1.19.2
ionic (Ionic CLI) : 3.20.0

global packages:

cordova (Cordova CLI) : 8.0.0 

local packages:

@ionic/app-scripts : 3.1.9
Cordova Platforms  : ios 4.5.5
Ionic Framework    : ionic-angular 3.9.2


Node  : v10.5.0
npm   : 6.1.0 
OS    : macOS High Sierra
Xcode : Xcode 9.4.1 Build version 9F2000 

Environment Variables:

ANDROID_HOME : not set


backend : pro