Navigation is not allowed when the task is not in the foreground.

[realworld666]

System.InvalidOperationException: Navigation is not allowed when the task is not in the foreground.
   at System.Windows.Navigation.NavigationService.Navigate(Uri source)
   at Cyclestreets.Pages.ExtendedSplash.<instance_positionchanged>b__3_1()
   at Cyclestreets.SmartDispatcher.BeginInvoke(Action action)
   at Cyclestreets.Pages.ExtendedSplash.<instance_positionchanged>b__3_0()