Qt Purchasing API initialization error

It seems that the InAppBillingService service fails to bind to the Qt Activity.

I'm getting the following output at:

W/ContextImpl( 4718): Implicit intents with startService are not safe: Intent { act=com.android.vending.billing.InAppBillingService.BIND } android.content.ContextWrapper.bindService:517 com.digia.qt5.android.purchasing.QtInAppPurchase.initializeConnection:118 dalvik.system.NativeStart.run:-2 

I had no problems using Qt Purchasing API until now. It worked fine with a version of QT RC 5.3 downloaded a week ago. The products were being registered and I was able to retrieve prices. But as with the final Qt 5.3 release, this stopped working.

I'm realy not sure where this comes from, as the same QML code worked with a version of Qt 5.3 RC but it doesn't with Qt 5.3 final.