I've installed Gallery Server Pro on my local Windows 8 system and I can view the sample image. BUT, the 'login' button is dead (does nothing) and the 'search' magnifying glass button is also dead (does nothing.)
I examined the devault page using Visual Studio 2010 Ultimate and I see a 'form1' runat=server. But I can't find form1 anywhere in the source, so I have nothing more to look at for debugging.