Thanks to both of you, Ashantara and Linken, for your advice. I did try your suggestions but once again without success. In view of this I raised a ticket on Arenanet on December 1st and after many e-mails, both to and from, they finally came up with a solution. The thing that helped me to get 'back on track' was to, and I quote, 'Activate Chapter 1 - Whisper in the Dark for us. Then re-activate Chapter 5 - Champions for us'. I don't see the logic in this but it worked. Thanks once again for your help.