PGP Viewer has been replaced by the gEVAL Browser. gEVAL browser functions exactly the same as PGPViewer, but with some new features, and new assemblies. PGP Viewer will not be maintained at this point. Please update your bookmarks to 

http://geval.sanger.ac.uk
  
For the PGP Viewer blog, this has now been updated to

http://gevalbrowser.blogspot.co.uk

any questions, comments please contact the gEVAL team (geval-help@sanger.ac.uk).