XLabs and PCLStorage bug since Xamarin.Forms 2 update

I'm developing a cross-platform application (PCL) which worked like a charm before i decided to update "Xamarin.Forms" and "Xamarin.Forms.Maps" from version 1.3 to version 2.0.0.6484.

Since that time, i just can't make working "XLabs" geolocation and "PCLStorage" libraries.

1) XLabs.Platform.Services.Geolocation.GetPositionAsync().
This method never respond and let app thread waiting during minutes before leaving the hand.

2) The simple use of the "PCLStorage" library crashes the whole app.

Thanks for your help.