inAppBrowser stopped working

My app uses the Cordova plugin inAppBrowser. I’ve updated my ionic & cordova environment; and updated cordova-plugin-inappbrowser to version 1.7.2

Now this line of code does nothing:
$, “_system”, { location: ‘no’, clearcache: ‘yes’, toolbar: ‘yes’, closebuttoncaption: $translate.instant(“SCAN.BACK”), EnableViewPortScale:‘yes’ });

I don’t get any error in the console (when I run the app using: ionic cordova run android -lc), and nothing happens…
How can I know what’s wrong?