Adobe Acrobat is running but no user interface is shown on Windows 8.1

We've recently come across a strange problem after upgrading to Windows 8.1.

We use a Windows forms based test construct application that generates PDF documents and then displays them in the .NET WebBrowser control.

The application (and Visual Studio when it is hosting the application) run as Administrator (configured in the App.Manifest) causing a UAC problem when the application is debugged.

What we've noticed is that the .NET WebBrowser control cannot display the PDF when the application is running under UAC nor an the PDF be launched using the System.Diagnostics.Process.Start() method.

If we remove the lines in the App.Manifest file the PDF displays correctly in the browser and also launches externally.

When running as Administrator the Acrobat process is running (it can be seen in Task Manager) however isn't visible in the user interface.

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