labels and buttons do not resize after Xamarin.Forms update

I have an old (last year) forms project that I updated to the latest NuGet libs this last week. When I did the behavior of some dynamically generated content changed. My label is defined as such:

    <Label x:Name="showText1" Text="" VerticalTextAlignment="Center" HorizontalTextAlignment="Center" LineBreakMode="CharacterWrap"/>

Previously when the code behind wrote to showText1.Text the width of the label would resize to match the content. Currently when .Text property is updated the Width seems to be zero and nothing is displayed. However, if the display is rotated the the label will resize and the previously written content will be displayed.

Something similar is happening to some buttons on another form but I'm assuming the solution to this problem is the same. Again, this only started after the update to the latest Xamarin.Forms (3.0.0.561731)

Also, something else that I do not understand is these tags in the .g.cs file:

    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("Xamarin.Forms.Build.Tasks.XamlG", "2.0.0.0")]

I tried to remove them but it didn't change affect the issue.

Thanks in advance,

Jacob